-2(15m) +3 (-12)
How to solve this equation

Answers

Answer 1

The equation -2(15m) + 3(-12) simplifies to -30m - 36.

To solve the equation -2(15m) + 3(-12), we need to apply the distributive property and perform the necessary operations in the correct order.

Let's break down the equation step by step:

-2(15m) means multiplying -2 by 15m.

This can be rewritten as -2 * 15 * m = -30m.

Next, we have 3(-12), which means multiplying 3 by -12.

This can be simplified as 3 * -12 = -36.

Now, we have -30m + (-36).

To add these two terms, we simply combine the coefficients, giving us -30m - 36.

Therefore, the equation -2(15m) + 3(-12) simplifies to -30m - 36.

It's important to note that the distributive property allows us to distribute the coefficient to every term inside the parentheses. This property is used when we multiply -2 by 15m and 3 by -12.

By following these steps, we've simplified the equation and expressed it in its simplest form. The solution to the equation is -30m - 36.

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Related Questions

Question 2 (8 marks) A fruit growing company claims that only 10% of their mangos are bad. They sell the mangos in boxes of 100. Let X be the number of bad mangos in a box of 100. (a) What is the dist

Answers

The distribution of X is a binomial distribution since it satisfies the following conditions :There are a fixed number of trials. There are 100 mangos in a box.

The probability of getting a bad mango is always 0.10. The probability of getting a good mango is always 0.90.The probability of getting a bad mango is the same for each trial. This probability is always 0.10.The expected value of X is 10. The variance of X is 9. The standard deviation of X is 3.There are different ways to calculate these values. One way is to use the formulas for the mean and variance of a binomial distribution.

These formulas are

:E(X) = n p Var(X) = np(1-p)

where n is the number of trials, p is the probability of success, E(X) is the expected value of X, and Var(X) is the variance of X. In this casecalculate the expected value is to use the fact that the expected value of a binomial distribution is equal to the product of the number of trials and the probability of success. In this case, the number of trials is 100 and the probability of success is 0.90.

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A function is given. f(x) = 3 - 3x^2; x = 1, x = 1 + h Determine the net change between the given values of the variable. Determine the average rate of change between the given values of the variable.

Answers

The average rate of change between x = 1 and x = 1 + h is -3h - 6.

The function given is f(x) = 3 - 3x², x = 1, x = 1 + h; determine the net change and average rate of change between the given values of the variable.

The net change is the difference between the final and initial values of the dependent variable.

When x changes from 1 to 1 + h, we can calculate the net change in f(x) as follows:

Initial value: f(1) = 3 - 3(1)² = 0

Final value: f(1 + h) = 3 - 3(1 + h)²

Net change: f(1 + h) - f(1) = [3 - 3(1 + h)²] - 0

= 3 - 3(1 + 2h + h²) - 0

= 3 - 3 - 6h - 3h²

= -3h² - 6h

Therefore, the net change between x = 1 and x = 1 + h is -3h² - 6h.

The average rate of change is the slope of the line that passes through two points on the curve.

The average rate of change between x = 1 and x = 1 + h can be found using the formula:

(f(1 + h) - f(1)) / (1 + h - 1)= (f(1 + h) - f(1)) / h

= [-3h² - 6h - 0] / h

= -3h - 6

Therefore, the average rate of change between x = 1 and x = 1 + h is -3h - 6.

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A classic rock station claims to play an average of 50 minutes of music every hour. However, people listening to the station think it is less. To investigate their claim, you randomly select 30 different hours during the next week and record what the radio station plays in each of the 30 hours. You find the radio station has an average of 47.92 and a standard deviation of 2.81 minutes. Run a significance test of the company's claim that it plays an average of 50 minutes of music per hour.

Answers

Based on the sample data, the average music playing time of the radio station is 47.92 minutes per hour, which is lower than the claimed average of 50 minutes per hour.

Is there sufficient evidence to support the radio station's claim of playing an average of 50 minutes of music per hour?

To test the significance of the radio station's claim, we can use a one-sample t-test. The null hypothesis (H0) is that the true population mean is equal to 50 minutes, while the alternative hypothesis (H1) is that the true population mean is different from 50 minutes.

Using the provided sample data of 30 different hours, with an average of 47.92 minutes and a standard deviation of 2.81 minutes, we calculate the t-statistic. With the t-statistic, degrees of freedom (df) can be determined as n - 1, where n is the sample size. In this case, df = 29.

By comparing the calculated t-value with the critical value at the desired significance level (e.g., α = 0.05), we can determine whether to reject or fail to reject the null hypothesis. If the calculated t-value falls within the critical region, we reject the null hypothesis, indicating sufficient evidence to conclude that the average music playing time is less than 50 minutes per hour.

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Test the claim that the proportion of people who own cats is
smaller than 20% at the 0.005 significance level. The null and
alternative hypothesis would be:
H 0 : p = 0.2 H 1 : p < 0.2
H 0 : μ ≤

Answers

In hypothesis testing, the null hypothesis is always the initial statement to be tested. In the case of the problem above, the null hypothesis (H0) is that the proportion of people who own cats is equal to 20% or p = 0.2.

Given, The null hypothesis is,  H0 : p = 0.2

The alternative hypothesis is, H1 : p < 0.2

Where p represents the proportion of people who own cats.

Since this is a left-tailed test, the p-value is the area to the left of the test statistic on the standard normal distribution.

Using a calculator, we can find that the p-value is approximately 0.0063.

Since this p-value is less than the significance level of 0.005, we reject the null hypothesis and conclude that there is sufficient evidence to suggest that the proportion of people who own cats is less than 20%.

Summary : The null hypothesis (H0) is that the proportion of people who own cats is equal to 20% or p = 0.2. The alternative hypothesis (H1), on the other hand, is that the proportion of people who own cats is less than 20%, or p < 0.2.Using a calculator, we can find that the p-value is approximately 0.0063. Since this p-value is less than the significance level of 0.005, we reject the null hypothesis and conclude that there is sufficient evidence to suggest that the proportion of people who own cats is less than 20%.

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The Cartesian coordinates of a point are (−1,−3–√). (i) Find polar coordinates (r,θ) of the point, where r>0 and 0≤θ<2π. r= 2 θ= 4pi/3 (ii) Find polar coordinates (r,θ) of the point, where r<0 and 0≤θ<2π. r= -2 θ= pi/3 (b) The Cartesian coordinates of a point are (−2,3). (i) Find polar coordinates (r,θ) of the point, where r>0 and 0≤θ<2π. r= sqrt(13) θ= (ii) Find polar coordinates (r,θ) of the point, where r<0 and 0≤θ<2π. r= -sqrt(13) θ=

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(i) For the point (-1, -3-√): r=2, θ=4π/3 | (ii) For the point (-1, -3-√): r=-2, θ=π/3 | For the point (-2, 3): (i) r=√(13), θ=  | (ii) r=-√(13), θ=

What are the polar coordinates (r, θ) of the point (-1, -3-√) for both r > 0 and r < 0, as well as the polar coordinates for the point (-2, 3) in both cases?

(i) For the point (-1, -3-√) with r > 0 and 0 ≤ θ < 2π:

r = 2

θ = 4π/3

(ii) For the point (-1, -3-√) with r < 0 and 0 ≤ θ < 2π:

r = -2

θ = π/3

For the point (-2, 3):

(i) With r > 0 and 0 ≤ θ < 2π:

r = √(13)

θ =

(ii) With r < 0 and 0 ≤ θ < 2π:

r = -√(13)

θ =

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x < -10 -10 < x < 30 30 x < 50 50 ≤ x 0 0.25 0.75 F(x) = 1 (a) P(X ≤ 50) (c) P(40 ≤X ≤ 60) (e) P(0 ≤X < 10) (b) P(X ≤ 40) (d) P(X< 0) (f) P(-10 < X < 10)

Answers

The probabilities are,

(a)  P(X ≤ 50) = 1

(b) P(X ≤ 40) = 0.75

(c) P(40 ≤ X ≤ 60) = 0.25

(d) P(X < 0) = 0

(e) P(0 ≤ X < 10) = 0.25

(f) P(-10 < X < 10) = 0.25

a) For P(X ≤ 50):

We have to add the probabilities of all the values of X that are less than or equal to 50.

Since F(x) = 1 when x is greater than or equal to 50, we have,

⇒ P(X ≤ 50) = P(X < -10) + P(-10 ≤ X < 30) + P(30 ≤ X < 50) + P(X ≥ 50)

⇒ P(X ≤ 50) = 0 + 0.25 + 0.75 + 1

⇒ P(X ≤ 50) = 2

Since, probabilities cannot be greater than 1.

Therefore, the correct answer is,

⇒ P(X ≤ 50) = P(X < -10) + P(-10 ≤ X < 30) + P(30 ≤ X < 50) + P(X ≤ 50)

⇒ P(X ≤ 50) = 0 + 0.25 + 0.75 + 0

⇒ P(X ≤ 50) = 1

So, the probability that X is less than or equal to 50 is 1.

b) For P(X ≤ 40):

We have to add the probabilities of all the values of X that are less than or equal to 40.

Since F(x) = 0.75 when x is greater than or equal to 30 and less than 50, and F(x) = 1 when x is greater than or equal to 50, we have,

⇒ P(X ≤ 40) = P(X < -10) + P(-10 ≤ X < 30) + P(30 ≤ X ≤ 40)

⇒ P(X ≤ 40) = 0 + 0.25 + 0.5

⇒ P(X ≤ 40) = 0.75

So, the probability that X is less than or equal to 40 is 0.75.

c) For P(40 ≤ X ≤ 60):

To find P(40 ≤ X ≤ 60), we have to subtract the probability of X being less than 40 from the probability of X being less than or equal to 60.

Since F(x) = 1 when x is greater than or equal to 50, we have,

⇒ P(40 ≤ X ≤ 60) = P(X ≤ 60) - P(X ≤ 40)

⇒ P(40 ≤ X ≤ 60) = 1 - 0.75

⇒ P(40 ≤ X ≤ 60) = 0.25

So, the probability that X is between 40 and 60 (inclusive) is 0.25.

d) For P(X < 0):

To find P(X < 0), we have to add the probabilities of all the values of X that are less than 0. Since F(x) = 0 when x is less than -10, we have,

⇒ P(X < 0) = P(X < -10)

⇒ P(X < 0) = 0

So, the probability that X is less than 0 is 0.

e) For P(0 ≤ X < 10):

To find P(0 ≤ X < 10), we have to subtract the probability of X being less than 0 from the probability of X being less than or equal to 10.

Since F(x) = 0.25 when x is greater than or equal to -10 and less than 30, we have,

⇒ P(0 ≤ X < 10) = P(X ≤ 10) - P(X < 0)

⇒ P(0 ≤ X < 10) = P(X ≤ 10)

⇒ P(0 ≤ X < 10) = F(10)

⇒ P(0 ≤ X < 10) = 0.25

So, the probability that X is between 0 (inclusive) and 10 (exclusive) is 0.25.

f) For P(-10 < X < 10):

To find P(-10 < X < 10), we have to subtract the probability of X being less than or equal to -10 from the probability of X being less than or equal to 10.

Since F(x) = 0.25 when x is greater than or equal to -10 and less than 30, we have,

⇒ P(-10 < X < 10) = P(X ≤ 10) - P(X ≤ -10)

⇒ P(-10 < X < 10) = F(10) - F(-10)

⇒ P(-10 < X < 10) = 0.25 - 0

⇒ P(-10 < X < 10) = 0.25

So, the probability that X is between -10 (exclusive) and 10 (exclusive) is 0.25.

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The complete question is attached below:

Solve the following LP problem using level curves. (If there is no solution, enter NO SOLUTION.) MAX: 4X₁ + 5X2 Subject to: 2X₁ + 3X₂ < 114 4X₁ + 3X₂ ≤ 152 X₁ + X₂2 85 X1, X₂ 20 What is the optimal solution? (X₁₁ X₂) = (C What is the optimal objective function value?

Answers

The optimal solution is (19, 25.3)

The optimal objective function value is 202.5

Finding the maximum possible value of the objective function

From the question, we have the following parameters that can be used in our computation:

Objective function, Max: 4X₁ + 5X₂

Subject to

2X₁ + 3X₂ ≤ 114

4X₁ + 3X₂ ≤ 152

X₁ + X₂ ≤ 85

X₁, X₂ ≥ 0

Next, we plot the graph (see attachment)

The coordinates of the feasible region is (19, 25.3)

Substitute these coordinates in the above equation, so, we have the following representation

Max = 4 * (19) + 5 * (25.3)

Max = 202.5

The maximum value above is 202.5 at (19, 25.3)

Hence, the maximum value of the objective function is 202.5

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The 40-ft-long A-36 steel rails on a train track are laid with a small gap between them to allow for thermal expansion. The cross-sectional area of each rail is 6.00 in2.

Part B: Using this gap, what would be the axial force in the rails if the temperature were to rise to T3 = 110 ∘F?

Answers

The axial force in the rails if the temperature were to rise to T3 = 110 ∘F is approximately 84 kips.

Given data: Length of A-36 steel rails = 40 ft

Cross-sectional area of each rail = 6.00 in².

The temperature of the steel rails increases from T₁ = 68°F to T₃ = 110°F.Multiply the coefficient of thermal expansion, alpha, by the temperature change and the length of the rail to determine the change in length of the rail:ΔL = alpha * L * ΔT

Where:L is the length of the railΔT is the temperature differencealpha is the coefficient of thermal expansion of A-36 steel. It is given that the coefficient of thermal expansion of A-36 steel is

[tex]6.5 x 10^−6/°F.ΔL = (6.5 x 10^−6/°F) × 40 ft × (110°F - 68°F)= 0.013 ft = 0.156[/tex]in

This is the change in length of the rail due to the increase in temperature.

There is a small gap between the steel rails to allow for thermal expansion. The change in the length of the rail due to an increase in temperature will be accommodated by the gap. Since there are two rails, the total change in length will be twice this value:

ΔL_total = 2 × ΔL_total = 2 × 0.013 ft = 0.026 ft = 0.312 in

This is the total change in length of both rails due to the increase in temperature.

The axial force in the rails can be calculated using the formula:

F = EA ΔL / L

Given data:

[tex]E = Young's modulus for A-36 steel = 29 x 10^6 psi = (29 × 10^6) / (12 × 10^3)[/tex]ksiA = cross-sectional area = 6.00 in²ΔL = total change in length of both rails = 0.312 inL = length of both rails = 80 ftF = (EA ΔL) / L= [(29 × 10^6) / (12 × 10^3) ksi] × (6.00 in²) × (0.312 in) / (80 ft)≈ 84 kips

Therefore, the axial force in the rails if the temperature were to rise to T3 = 110 ∘F is approximately 84 kips.

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A pipes manufacturer makes pipes with a length that is supposed to be 17 inches. A quality control technician sampled 26 pipes and found that the sample mean length was 17.07 inches and the sample standard deviation was 0.28 inches. The technician claims that the mean pipe length is not 17 inches. What type of hypothesis test should be performed? Select What is the test statistic? Ex: 0.123 Does sufficient evidence exist at the ax = 0.01 significance level to support the technician's claim? Select

Answers

There is not sufficient proof at the α = 0.01 importance level to aid the technician's declare that the suggest pipe length isn't 17 inches.

According to the,

We need to perform a one-sample t-test to determine whether the sample mean length of 17.07 inches is significantly different from the population mean length of 17 inches.

The test statistic for a one-sample t-test is calculated as follows,

⇒ t = (X - μ) / (s / √n)

where X is the sample mean length,

μ is the population mean length (in this case, 17 inches),

s is the sample standard deviation,

And n is the sample size (in this case, 26).

Putting in the values given, we get,

⇒ t = (17.07 - 17) / (0.28 / √26) = 1.65

To determine whether sufficient evidence exists at the α = 0.01 significance level to support the technician's claim,

We need to compare the calculated t-value to the critical t-value from the t-distribution with df = n-1 = 25 and α = 0.01.

Using a t-table or calculator, we find that the critical t-value is ±2.492.

Since our calculated t-value of 1.65 is less than the critical t-value of 2.492,

We fail to reject the null hypothesis that the mean pipe length is 17 inches.

Therefore, There is not sufficient evidence at the α = 0.01 significance level to support the technician's claim that the mean pipe length is not 17 inches.

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Construct both a 98% and a 90% confidence interval for $1. B₁ = 48, s = 4.3, SS = 69, n = 11 98%

Answers

98% Confidence Interval: The 98% confidence interval for B₁ is approximately (42.58, 53.42), indicating that we can be 98% confident that the true value of the coefficient falls within this range.

90% Confidence Interval: The 90% confidence interval for B₁ is approximately (45.05, 50.95), suggesting that we can be 90% confident that the true value of the coefficient is within this interval.

To construct a confidence interval for the coefficient B₁ at a 98% confidence level, we can use the t-distribution. Given the following values:

B₁ = 48 (coefficient estimate)

s = 4.3 (standard error of the coefficient estimate)

SS = 69 (residual sum of squares)

n = 11 (sample size)

The formula to calculate the confidence interval is:

Confidence Interval = B₁ ± t_critical * (s / √SS)

Degrees of freedom (df) = n - 2 = 11 - 2 = 9 (for a simple linear regression model)

Using the t-distribution table, for a 98% confidence level and 9 degrees of freedom, the t_critical value is approximately 3.250.

Plugging in the values:

Confidence Interval = 48 ± 3.250 * (4.3 / √69)

Calculating the confidence interval:

Lower Limit = 48 - 3.250 * (4.3 / √69) ≈ 42.58

Upper Limit = 48 + 3.250 * (4.3 / √69) ≈ 53.42

Therefore, the 98% confidence interval for B₁ is approximately (42.58, 53.42).

To construct a 90% confidence interval, we use the same method, but with a different t_critical value. For a 90% confidence level and 9 degrees of freedom, the t_critical value is approximately 1.833.

Confidence Interval = 48 ± 1.833 * (4.3 / √69)

Calculating the confidence interval:

Lower Limit = 48 - 1.833 * (4.3 / √69) ≈ 45.05

Upper Limit = 48 + 1.833 * (4.3 / √69) ≈ 50.95

Therefore, the 90% confidence interval for B₁ is approximately (45.05, 50.95).

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Suppose that f is entire and f'(z) is bounded on the complex plane. Show that f(z) is linear

Answers

f(z) = u + iv = (A + iB)(x + iy) + (C1 + iC2)Thus, f(z) is a linear function.

Given that f is entire and f'(z) is bounded on the complex plane, we need to show that f(z) is linear.

To prove this, we will use Liouville's theorem. According to Liouville's theorem, every bounded entire function is constant.

Since f'(z) is bounded on the complex plane, it is bounded everywhere in the complex plane, so it is a bounded entire function. Thus, by Liouville's theorem, f'(z) is constant.

Hence, by the Cauchy-Riemann equations, we have:∂u/∂x = ∂v/∂y and ∂u/∂y = -∂v/∂x

Where f(z) = u(x, y) + iv(x, y) and f'(z) = u_x + iv_x = v_y - iu_ySince f'(z) is constant, it follows that u_x = v_y and u_y = -v_x

Also, we know that f is entire, so it satisfies the Cauchy-Riemann equations.

Hence, we have:∂u/∂x = ∂v/∂y = v_yand∂u/∂y = -∂v/∂x = -u_ySubstituting these into the Cauchy-Riemann equations, we obtain:u_x = u_y = v_x = v_ySince f'(z) is constant, we have:u_x = v_y = A and u_y = -v_x = -B

where A and B are constants. Hence, we have:u = Ax + By + C1 and v = -Bx + Ay + C2

where C1 and C2 are constants.

Therefore, f(z) = u + iv = (A + iB)(x + iy) + (C1 + iC2)Thus, f(z) is a linear function.

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Find an autonomous differential equation with all of the following properties:
equilibrium solutions at y=0 and y=3,
y' > 0 for 0 y' < 0 for -inf < y < 0 and 3 < y < inf
dy/dx =

Answers

To find an autonomous differential equation with the given properties, we can start by considering the equilibrium solutions. Since we want equilibrium solutions at y=0 and y=3, we can set up a quadratic equation in the form:

y(y - 3) = 0

Expanding the equation:

y^2 - 3y = 0

Now, let's consider the signs of y' in different intervals:

1. For 0 < y < 3, we want y' to be positive. We can introduce a factor of y on the right-hand side of the equation to ensure this:

y' = ky(y - 3)

2. For y < 0 and y > 3, we want y' to be negative. We can introduce a negative factor of y on the right-hand side to achieve this:

y' = ky(y - 3)(y - 0)

Where k is a constant that determines the rate of change.

Combining the conditions, we can write the autonomous differential equation with the given properties as:

y' = ky(y - 3)(y - 0)

This equation has equilibrium solutions at y=0 and y=3, and satisfies the conditions y' > 0 for 0 < y < 3, and y' < 0 for y < 0 and y > 3.

all the three terms on the right-hand side are positive and hence dy/dx is negative. Thus, this satisfies all the properties given. Therefore, the required autonomous differential equation is:dy/dx = a (y - 3) (y) (y - b).

We can obtain the autonomous differential equation having all of the given properties as shown below:First of all, let's determine the equilibrium solutions:dy/dx = 0 at y = 0 and y = 3y' > 0 for 0 < y < 3For -∞ < y < 0 and 3 < y < ∞, dy/dx < 0This means y = 0 and y = 3 are stable equilibrium solutions. Let's take two constants a and b.a > 0, b > 0 (these are constants)An autonomous differential equation should have the following form:dy/dx = f(y)To get the desired properties, we can write the differential equation as shown below:dy/dx = a (y - 3) (y) (y - b)If y < 0, y - 3 < 0, y - b < 0, and y > b. Therefore, all the three terms on the right-hand side are negative and hence dy/dx is positive.If 0 < y < 3, y - 3 < 0, y - b < 0, and y > b. Therefore, all the three terms on the right-hand side are negative and hence dy/dx is positive.If y > 3, y - 3 > 0, y - b > 0, and y > b. Therefore, all the three terms on the right-hand side are positive and hence dy/dx is negative. Thus, this satisfies all the properties given. Therefore, the required autonomous differential equation is:dy/dx = a (y - 3) (y) (y - b).

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b) If the joint probability distribution of three discrete random variables X, Y, and Z is given by, f(x, y, z)=. (x+y)z 63 for x = 1,2; y=1,2,3; z = 1,2 find P(X=2, Y + Z ≤3).

Answers

The probability P(X=2, Y+Z ≤ 3) is 13. Random variables are variables in probability theory that represent the outcomes of a random experiment or event.

To find the probability P(X=2, Y+Z ≤ 3), we need to sum up the joint probabilities of all possible combinations of X=2, Y, and Z that satisfy the condition Y+Z ≤ 3.

Step 1: List all the possible combinations of X=2, Y, and Z that satisfy Y+Z ≤ 3:

X=2, Y=1, Z=1

X=2, Y=1, Z=2

X=2, Y=2, Z=1

Step 2: Calculate the joint probability for each combination:

For X=2, Y=1, Z=1:

f(2, 1, 1) = (2+1) * 1 = 3

For X=2, Y=1, Z=2:

f(2, 1, 2) = (2+1) * 2 = 6

For X=2, Y=2, Z=1:

f(2, 2, 1) = (2+2) * 1 = 4

Step 3: Sum up the joint probabilities:

P(X=2, Y+Z ≤ 3) = f(2, 1, 1) + f(2, 1, 2) + f(2, 2, 1) = 3 + 6 + 4 = 13

They assign numerical values to the possible outcomes of an experiment, allowing us to analyze and quantify the probabilities associated with different outcomes.

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The following partial job cost sheet is for a job lot of 2,500 units completed. JOB COST SHEET Customer’s Name Huddits Company Quantity 2,500 Job Number 202 Date Direct Materials Direct Labor Overhead Requisition Cost Time Ticket Cost Date Rate Cost March 8 #55 $ 43,750 #1 to #10 $ 60,000 March 8 160% of Direct Labor Cost $ 96,000 March 11 #56 25,250

Answers

Direct Materials Cost: $43,750

Direct Labor Cost: $60,000

Overhead Cost: $96,000

Based on the partial job cost sheet provided, the costs incurred for the job lot of 2,500 units completed are as follows:

Direct Materials Cost:

The direct materials cost for the job is listed as $43,750. This cost represents the total cost of the materials used in the production of the 2,500 units.

Direct Labor Cost:

The direct labor cost is not explicitly mentioned in the given information. However, it can be inferred from the "Time Ticket Cost" entry on March 8. The cost listed for time tickets from #1 to #10 is $60,000. This cost represents the direct labor cost for the job.

Overhead Cost:

The overhead cost is determined as 160% of the direct labor cost. In this case, 160% of $60,000 is $96,000.

Please note that the given information does not provide a breakdown of the specific costs within the overhead category, and it is also missing information such as the job number for March 11 (#56) and the associated costs for that particular job.

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A population proportion is 0.40. A random sample of size 300 will be taken and the sample proportion p will be used to estimate the population proportion. Use the z-table. Round your answers to four d

Answers

The sample proportion p should be between 0.3574 and 0.4426

Given a population proportion of 0.40, a random sample of size 300 will be taken and the sample proportion p will be used to estimate the population proportion.

We need to find the z-value for a sample proportion p.

Using the z-table, we get that the z-value for a sample proportion p is:

z = (p - P) / √[P(1 - P) / n]

where p = sample proportion

          P = population proportion

          n = sample size

Substituting the given values, we get

z = (p - P) / √[P(1 - P) / n]

  = (p - 0.40) / √[0.40(1 - 0.40) / 300]

  = (p - 0.40) / √[0.24 / 300]

  = (p - 0.40) / 0.0277

We need to find the values of p for which the z-score is less than -1.65 and greater than 1.65.

The z-score less than -1.65 is obtained when

p - 0.40 < -1.65 * 0.0277p < 0.3574

The z-score greater than 1.65 is obtained when

p - 0.40 > 1.65 * 0.0277p > 0.4426

Therefore, the sample proportion p should be between 0.3574 and 0.4426 to satisfy the given conditions.

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Solve the given differential equation by separation of variables
dy/dx = xy + 8y - x -8 / xy - 7y + X - 7

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This is the general solution to the given differential equation using separation of variables.

To solve the given differential equation using separation of variables, we'll rearrange the equation and separate the variables:

dy / dx = (xy + 8y - x - 8) / (xy - 7y + x - 7)

First, we'll rewrite the numerator and denominator separately:

dy / dx = [(x - 1)(y + 8)] / [(x - 1)(y - 7)]

Next, we can cancel out the common factor (x - 1) in both the numerator and denominator:

dy / dx = (y + 8) / (y - 7)

Now, we'll separate the variables by multiplying both sides by (y - 7):

(y - 7) dy = (y + 8) dx

To solve the equation, we'll integrate both sides:

∫ (y - 7) dy = ∫ (y + 8) dx

Integrating the left side with respect to y:

(1/2) y^2 - 7y = ∫ (y + 8) dx

Simplifying the right side:

(1/2) y^2 - 7y = xy + 8x + C

where C is the constant of integration.

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integral of 4x^2/(x^2+9)

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The integral of 4x²/(x²+9) is equal to 2 ln |x² + 9| - 18/(x²) + C, where C is the constant of integration.

The integral of `4x²/(x² + 9)` can be found by performing a substitution. The substitution u = x² + 9 can be used to convert the integral into a more manageable form. Therefore, `du/dx = 2x` or `x dx = (1/2) du`.Substituting `u = x² + 9` in the integral:∫(4x² / (x² + 9)) dxLet `u = x² + 9`, then `du = 2x dx` or `(1/2) du = x dx`.Substituting this into the integral:∫(4x² / (x² + 9)) dx= ∫(4x² / u) (1/2) du= 2 ∫(x² / u) du= 2 ∫(x² / (x² + 9)) dx= 2 [ln |x² + 9| - 9/x² + C]

Putting back the value of `u`:= 2 ln |x² + 9| - 18/(x²) + C The integral of `4x² / (x² + 9)` is equal to `2 ln |x² + 9| - 18/(x²) + C`. Therefore, the integral of 4x²/(x²+9) is equal to 2 ln |x² + 9| - 18/(x²) + C, where C is the constant of integration.

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determine the mean and variance of the random variable with the following probability mass function. f(x)=(64/21)(1/4)x, x=1,2,3 round your answers to three decimal places (e.g. 98.765).

Answers

The mean of the given random variable is approximately equal to 1.782 and the variance of the given random variable is approximately equal to -0.923.

Let us find the mean and variance of the random variable with the given probability mass function. The probability mass function is given as:f(x)=(64/21)(1/4)^x, for x = 1, 2, 3

We know that the mean of a discrete random variable is given as follows:μ=E(X)=∑xP(X=x)

Thus, the mean of the given random variable is:

μ=E(X)=∑xP(X=x)

= 1 × f(1) + 2 × f(2) + 3 × f(3)= 1 × [(64/21)(1/4)^1] + 2 × [(64/21)(1/4)^2] + 3 × [(64/21)(1/4)^3]

≈ 0.846 + 0.534 + 0.402≈ 1.782

Therefore, the mean of the given random variable is approximately equal to 1.782.

Now, we find the variance of the random variable. We know that the variance of a random variable is given as follows

:σ²=V(X)=E(X²)-[E(X)]²

Thus, we need to find E(X²).E(X²)=∑x(x²)(P(X=x))

Thus, E(X²) is calculated as follows:

E(X²) = (1²)(64/21)(1/4)^1 + (2²)(64/21)(1/4)^2 + (3²)(64/21)(1/4)^3

≈ 0.846 + 0.801 + 0.604≈ 2.251

Now, we have:E(X)² ≈ (1.782)² = 3.174

Then, we can calculate the variance as follows:σ²=V(X)=E(X²)-[E(X)]²=2.251 − 3.174≈ -0.923

The variance of the given random variable is approximately equal to -0.923.

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A charge of 8 uC is on the y axis at 2 cm, and a second charge of -8 uC is on the y axis at -2 cm. х 4 + 3 28 uC 1 4 μC 0 ++++ -1 1 2 3 4 5 6 7 8 9 -2 -8 uC -3 -4 -5 -- Find the force on a charge of 4 uC on the x axis at x = 6 cm. The value of the Coulomb constant is 8.98755 x 109 Nm²/C2. Answer in units of N.

Answers

The electric force experienced by a charge Q1 due to the presence of another charge Q2 located at a distance r from Q1 is given by the Coulomb’s Law as:

F = (1/4πε0) (Q1Q2/r²)

where ε0 is the permittivity of free space and is equal to 8.854 x 10⁻¹² C²/Nm²

Given : Charge Q1 = 4 uCCharge Q2 = 8 uC - (-8 uC) = 16 uC

Distance between Q1 and Q2 = (6² + 2²)¹/²

= (40)¹/² cm

= 6.3246 cm

Substituting the given values in the Coulomb’s Law equation : F = (1/4πε0) (Q1Q2/r²)

F = (1/4π x 8.98755 x 10⁹ Nm²/C²) (4 x 10⁻⁶ C x 16 x 10⁻⁶ C)/(6.3246 x 10⁻² m)²

F = 6.21 x 10⁻⁵ N

Answer: The force experienced by a charge of 4 uC on the x-axis at x = 6 cm is 6.21 x 10⁻⁵ N.

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Though opinion polls usually make 95% confidence statements, some sample surveys use other confidence levels. The monthly unemployment rate, for example, is based on the Current Population Survey of a

Answers

The margin of error would be larger because the cost of higher confidence is a larger margin of error.

Option A is the correct answer.

We have,

The margin of error is a measure of the uncertainty or variability in the sample estimate compared to the true population value.

A higher confidence level indicates a greater level of certainty in the estimate, which requires accounting for a larger range of potential values.

In the case of the unemployment rate, if the margin of error is announced as two-tenths of one percentage point with 90% confidence, it means that the estimated unemployment rate may vary by plus or minus 0.2 percentage points around the reported value with 90% confidence.

This range accounts for the uncertainty in the sample estimate.

If the confidence level were increased to 95%, it would require a higher level of certainty in the estimate, leading to a larger margin of error.

This larger margin of error would account for a wider range of potential values around the reported unemployment rate.

Therefore,

The margin of error would be larger for 95% confidence compared to 90% confidence.

Thus,

The margin of error would be larger because the cost of higher confidence is a larger margin of error.

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what is the application of series calculus 2 in the real world

Answers

For example, it can be used to calculate the trajectory of a projectile or the acceleration of an object. Engineering: Calculus is used to design and analyze structures such as bridges, buildings, and airplanes. It can be used to calculate stress and strain on materials or to optimize the design of a component.

Series calculus, particularly in Calculus 2, has several real-world applications across various fields. Here are a few examples:

1. Engineering: Series calculus is used in engineering for approximating values in various calculations. For example, it is used in electrical engineering to analyze alternating current circuits, in civil engineering to calculate structural loads, and in mechanical engineering to model fluid flow and heat transfer.

2. Physics: Series calculus is applied in physics to model and analyze physical phenomena. It is used in areas such as quantum mechanics, fluid dynamics, and electromagnetism. Series expansions like Taylor series are particularly useful for approximating complex functions in physics equations.

3. Economics and Finance: Series calculus finds application in economic and financial analysis. It is used in forecasting economic variables, calculating interest rates, modeling investment returns, and analyzing risk in financial markets.

4. Computer Science: Series calculus plays a role in computer science and programming. It is used in numerical analysis algorithms, optimization techniques, and data analysis. Series expansions can be utilized for efficient calculations and algorithm design.

5. Signal Processing: Series calculus is employed in signal processing to analyze and manipulate signals. It is used in areas such as digital filtering, image processing, audio compression, and data compression.

6. Probability and Statistics: Series calculus is relevant in probability theory and statistics. It is used in probability distributions, generating functions, statistical modeling, and hypothesis testing. Series expansions like power series are employed to analyze probability distributions and derive statistical properties.

These are just a few examples, and series calculus has applications in various other fields like biology, chemistry, environmental science, and more. Its ability to approximate complex functions and provide useful insights makes it a valuable tool for understanding and solving real-world problems.

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The equation 2x1 − x2 + 4x3 = 0 describes a plane in R 3 containing the origin. Find two vectors u1, u2 ∈ R 3 so that span{u1, u2} is this plane.

Answers

To find two vectors u1 and u2 ∈ R^3 that span the plane described by the equation 2x1 − x2 + 4x3 = 0 and containing the origin, we can solve the equation and express the solution in parametric form.

Let's assume x3 = t, where t is a parameter.

From the equation 2x1 − x2 + 4x3 = 0, we can isolate x1 and x2:

2x1 − x2 + 4x3 = 0

2x1 = x2 - 4x3

x1 = (1/2)x2 - 2x3

Now we can express x1 and x2 in terms of the parameter t:

x1 = (1/2)t

x2 = 2t

Therefore, any point (x1, x2, x3) on the plane can be written as (1/2)t * (2t) * t = (t/2, 2t, t), where t is a parameter.

To find vectors u1 and u2 that span the plane, we can choose two different values for t and substitute them into the parametric equation to obtain the corresponding points:

Let t = 1:

u1 = (1/2)(1) * (2) * (1) = (1/2, 2, 1)

Let t = -1:

u2 = (1/2)(-1) * (2) * (-1) = (-1/2, -2, -1)

Therefore, the vectors u1 = (1/2, 2, 1) and u2 = (-1/2, -2, -1) span the plane described by the equation 2x1 − x2 + 4x3 = 0 and containing the origin.

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Find the missing value required to create a probability
distribution. Round to the nearest hundredth.
x / P(x)
0 / 0.06
1 / 0.06
2 / 0.13
3 / 4 / 0.1

Answers

The missing value required to create a probability distribution is 0.61 (rounded to the nearest hundredth).

To find the missing value, we can start by summing up all the probabilities given in the table: P(0) + P(1) + P(2) + P(3) + P(4).

We know that the sum of probabilities should equal 1, so we can set up the equation:

P(0) + P(1) + P(2) + P(3) + P(4) = 0.06 + 0.06 + 0.13 + ? + 0.1 = 1.

By simplifying the expression, we have:

0.39 + ? = 1.

or

? = 1 - 0.39.

or

1 - 0.39 = ?

Performing the subtraction, we get:

1 - 0.39= 0.61.

Therefore, the missing value required to create a probability distribution is 0.61, rounded to the nearest hundredth.

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you are driving to a conference in cleveland and have already traveled 100 miles. you still have 50 more miles to go. when you arrive in cleveland, how many miles will you have driven?
O 50 miles
O 150 miles
O 1200 miles
O 1500 miles

Answers

When you arrive in Cleveland, you will have driven a total of 150 miles.

Based on the given information, you have already traveled 100 miles and have 50 more miles to go. To find the total distance you will have driven, you need to add the distance you have already traveled to the remaining distance. Therefore, 100 miles (already traveled) + 50 miles (remaining) equals 150 miles in total.

To elaborate further, when you start your journey, you have already covered 100 miles. As you continue driving towards Cleveland, you still have 50 more miles to cover. Adding these two distances together, you get a total of 150 miles. This calculation is based on the assumption that there are no detours or additional stops along the way. Therefore, when you finally arrive at the conference in Cleveland, you will have driven a total distance of 150 miles.

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Randois samples of four different models of cars were selected and the gas mileage of each car was meased. The results are shown below Z (F/PALE ma II # 21 226 22 725 21 Test the claim that the four d

Answers

In the given problem, random samples of four different models of cars were selected and the gas mileage of each car was measured. The results are shown below:21 226 22 725 21
Given that,The null hypothesis H0: All the population means are equal. The alternative hypothesis H1: At least one population mean is different from the others .


To find the hypothesis test, we will use the one-way ANOVA test. We calculate the grand mean (X-bar) and the sum of squares between and within to obtain the F-test statistic. Let's find out the sample size (n), the total number of samples (N), the degree of freedom within (dfw), and the degree of freedom between (dfb).
Sample size (n) = 4 Number of samples (N) = n × 4 = 16 Degree of freedom between (dfb) = n - 1 = 4 - 1 = 3 Degree of freedom within (dfw) = N - n = 16 - 4 = 12 Total sum of squares (SST) = ∑(X - X-bar)2
From the given data, we have X-bar = (21 + 22 + 26 + 25) / 4 = 23.5
So, SST = (21 - 23.5)2 + (22 - 23.5)2 + (26 - 23.5)2 + (25 - 23.5)2 = 31.5 + 2.5 + 4.5 + 1.5 = 40.0The sum of squares between (SSB) is calculated as:SSB = n ∑(X-bar - X)2
For the given data,SSB = 4[(23.5 - 21)2 + (23.5 - 22)2 + (23.5 - 26)2 + (23.5 - 25)2] = 4[5.25 + 2.25 + 7.25 + 3.25] = 72.0 The sum of squares within (SSW) is calculated as:SSW = SST - SSB = 40.0 - 72.0 = -32.0
The mean square between (MSB) and mean square within (MSW) are calculated as:MSB = SSB / dfb = 72 / 3 = 24.0MSW = SSW / dfw = -32 / 12 = -2.6667
The F-statistic is then calculated as:F = MSB / MSW = 24 / (-2.6667) = -9.0
Since we are testing whether at least one population mean is different, we will use the F-test statistic to test the null hypothesis. If the p-value is less than the significance level, we will reject the null hypothesis. However, the calculated F-statistic is negative, and we only consider the positive F-values. Therefore, we take the absolute value of the F-statistic as:F = |-9.0| = 9.0The p-value corresponding to the F-statistic is less than 0.01. Since it is less than the significance level (α = 0.05), we reject the null hypothesis. Therefore, we can conclude that at least one of the population means is different from the others.

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if q is inversely proportional to r squared and q=30 when r=3 find r when q=1.2

Answers

To find r when q=1.2, given that q is inversely proportional to r squared and q=30 when r=3:

Calculate the value of k, the constant of proportionality, using the initial values of q and r.

Use the value of k to solve for r when q=1.2.

How can we determine the value of r when q is inversely proportional to r squared?

In an inverse proportion, as one variable increases, the other variable decreases in such a way that their product remains constant. To solve for r when q=1.2, we can follow these steps:

First, establish the relationship between q and r. The given information states that q is inversely proportional to r squared. Mathematically, this can be expressed as q = k/r², where k is the constant of proportionality.

Use the initial values to determine the constant of proportionality, k. Given that q=30 when r=3, substitute these values into the equation q = k/r². Solving for k gives us k = qr² = 30(3²) = 270.

With the value of k, we can solve for r when q=1.2. Substituting q=1.2 and k=270 into the equation q = k/r^2, we have 1.2 = 270/r². Rearranging the equation and solving for r gives us r²= 270/1.2 = 225, and thus r = √225 = 15.

Therefore, when q=1.2 in the inverse proportion q = k/r², the corresponding value of r is 15.

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determine whether the set s is linearly independent or linearly dependent. s = {(8, 2), (3, 5)}

Answers

the linear combination of s equals the zero vector if and only if t = 0.

To determine whether the set s is linearly independent or linearly dependent, we first consider the linear combination of the vectors in the set s.

The set s is given by s = {(8, 2), (3, 5)}.

Let's assume c1 and c2 are two scalars such that the linear combination of the set s equals to the zero vector.

Then, we get the following equations:

$$c_1(8,2)+c_2(3,5) = (0,0) $$

Expanding the above equation, we get:

$$8c_1+3c_2 = 0$$ and $$2c_1+5c_2=0$$

Solving the above equations, we obtain:

$$c_1=-\frac{5}{14}c_2$$

Hence,$$c_2=14t$$and$$c_1=-5t$$

Therefore, the linear combination of s equals the zero vector if and only if t = 0.

Since the trivial solution is the only solution, we conclude that the set s = {(8, 2), (3, 5)} is linearly independent.

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Which point would be a solution to the system of linear inequalities shown below

Answers

The points that are solutions to system of inequalities are: (2, 3) and (4, 3)

Selecting the point solution to the system of inequalities

From the question, we have the following parameters that can be used in our computation:

The graph (see attachment)

To find the solution to a system of graphed inequalities, you need to identify the region that satisfies all the inequalities in the system.

This region is the set of points that lie in the shaded area

Using the above as a guide, we have the following:

The points that are solutions to system of inequalities are: (2, 3) and (4, 3)

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The matrices A and B are given by

Exam ImageExam Image

and C = BA. Give the value of c 1,2 .

a) -14

b) 4

c) -12

d) 2

e) -13

f) None of the above.

Answers

To find the value of c1,2, we need to calculate the dot product of the first row of matrix A with the second column of matrix B.

The first row of matrix A is [3, -1, 2], and the second column of matrix B is [-2, 1, 3].

Taking the dot product of these vectors, we have:

c1,2 = (3 * -2) + (-1 * 1) + (2 * 3)

     = -6 - 1 + 6

     = -1

Therefore, the value of c1,2 is -1.

None of the given options (a, b, c, d, e) match the calculated value, so the correct answer is f) None of the above.

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Next question The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance, and standard deviation of the sample data set 12, 15, 23, 14, 14, 16,

Answers

For the given sample data set, the range is 11, the mean is 15.67, the variance is 16.14, and the standard deviation is 4.02.

To determine the range, mean, variance, and standard deviation of the given sample data set: 12, 15, 23, 14, 14, 16, we can follow these steps:

Range: The range is the difference between the maximum and minimum values in the data set.

In this case, the minimum value is 12 and the maximum value is 23. Therefore, the range is 23 - 12 = 11.

Mean: The mean is calculated by summing up all the values in the data set and dividing it by the total number of values.

For this data set, the sum is 12 + 15 + 23 + 14 + 14 + 16 = 94. Since there are 6 values in the data set, the mean is 94/6 = 15.67 (rounded to two decimal places).

Variance: The variance measures the spread or dispersion of the data set.

It is calculated by finding the average of the squared differences between each value and the mean.

We first calculate the squared differences: [tex](12 - 15.67)^2, (15 - 15.67)^2, (23 - 15.67)^2, (14 - 15.67)^2, (14 - 15.67)^2, (16 - 15.67)^2.[/tex]Then, we sum up these squared differences and divide by the number of values minus 1 (since it is a sample).

The variance for this data set is approximately 16.14 (rounded to two decimal places).

Standard Deviation: The standard deviation is the square root of the variance. In this case, the standard deviation is approximately 4.02 (rounded to two decimal places).

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Protein depends on diffusion of proteins through porins, followed by active import into the mito matrix through an aqueous translocation channel On September 1, 2013 Apex Corp. issued 25,000 shares of $0.50 par value common stock for $1.25 per share.Record the stock issue in general journal form.On August 15, 2013 Troy Ellison accepted 1,500 shares of $2.50 par common stock at par value for legal services he provided in the formation of XYZ Corp.Make the journal entry to record the transaction.On May 12, 2012 Wiley Corporation declared a $75,000 cash dividend on its common stock. The dividend is to be paid on July 1, 2012.Prepare the journal entries to record the transaction on May 12th & July 1st. Which type of ecologist would be most concerned with nutrient cycles?a. Species ecologistb. Ecosystem ecologistc. Community ecologistd. Organism ecologiste. Population ecologist "ive been at my job for four days, and ive already met all my coworkers!" amber says. which type of business does ember most likely work for? Constant volume versus constant pressure batch reac- tor Consider the following two well-mixed, isothermal gas-phase batch reactors for the elementary and irreversible decomposition of A to B, A 2B reactor 1: The reactor volume is held constant (reactor pressure therefore changes). reactor 2: The reactor pressure is held constant (reactor volume therefore changes). Both reactors are charged with pure A at 1.0 atm and k = 0.35 min (a) What is the fractional decrease in the concentration of A in reactors 1 and 2 after five minutes? (b) What is the total molar conversion of A in reactors 1 and 2 after five minutes? Rianna is 60 years old. She purchased a deferred annuity for $40,000. The annuity will begin paying her $400 per month at age 65 for the rest of her life. At age 65 her expected return multiple is 20. In the year that she is 67 years old, how much of the annuity will be taxable? Select one: a. $0. b. $2,000. c. $2,800. d. $4,000. people who laugh a lot have tended to have lower rates of .Carlos Cavalas, the manager of Echo Products' Brazilian Division, is trying to set the production schedule for the last quarter of the year. The Brazilian Division had planned to sell 69,960 units during the year, but by September 30 only the following activity had been reported.UnitsInventory, January 10Production2,000Sales2,000Inventory, September 30400The division can rent warehouse space to store up to 1,000 units. The minimum inventory level that the division should carry is 50 units. Mr. Cavalas is aware that production must be at least 200 units per quarter in order to retain a nucleus of key employees. Maximum production capacity is 1,500 units per quarter. Demand has been soft, and the sales forecast for the last quarter is only 600 units. Due to the nature of the division's operations, fixed manufacturing overhead is a major element of product cost.Assume that the division is using variable costing. How many units should be scheduled for production during the last quarter of the year? (The basic formula for computing the required production for a period in a company is Expected sales + Desired ending inventory - Beginning inventory = Required production.) Show computations and explain your answer. Will the number of units scheduled for production affect the division's reported income or loss for the year? Explain.Assume that the division is using absorption costing and that the divisional manager is given an annual bonus based on divisional operating income. If Mr. Cavalas wants to maximize his division's operating income for the year, how many units should be scheduled for production during the last quarter? (See the formula in 1 above.) Explain.Identify the ethical issues involved in the decision Mr. Cavalas must make about the level of production for the last quarter of the year. Many companies have switched from absorption costing to variable costing for internal reporting: Select one: a. to comply with external reporting requirements as required by GAAP b. to increase bonuses for managers c. so the denominator level is more accurate d. to reduce the undesirable incentive to build up inventories that would show higher operating income Based on past experience, a bank believes that 12% of the people who receive loans will not make payments on time. The bank has recently approved 500 loans. Answer the following questions. a) What are the mean and standard deviation of the proportion of clients in this group who may not make timely payments? + (O) = 0.12 SD (P) = 0.015 (Round to three decimal places as needed.) b) What assumptions underlie your model? Are the conditions met? A. With reasonable assumptions about the sample, all the conditions are met. OB. The 10% condition is not met. O C. The randomization and success/failure conditions are not met. OD. The success/failure condition is not met. O E. The randomization condition is not met. Based on past experience, a bank believes that 12% of the people who receive loans will not make payments on time. The bank has recently approved 500 loans. Answer the following questions. Tuo Turuvimicurvu unu vuvvvvurunur vonUILIVIT un Tum OD. The success/failure condition is not met. O E. The randomization condition is not met. OF. The randomization and 10% conditions are not met. O G. The 10% and success/failure conditions are not met. O H. Without unreasonable assumptions, none of the conditions are met. c) What is the probability that over 13% of these clients will not make timely payments? pl>0.13) =((Round to three decimal places as needed.)