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2. How do the sizes of the circles compare?





3. Are triangles ABC and DEF similar? Explain your reasoning.

4. How can you use the coordinates of A to find the coordinates of D?

Answer:

6.25 minutes

Step-by-step explanation:

So, if there are 96 tests being graded in 2 minutes, the average per minute (using the equation 96/2 = average) would be 48 per minute. Next you would do 300/48 to get the number of minutes that it would take to grade that amount. The answer to that would be 6.25, So it would take approximately 6.25 minutes.

The number of students on the bus is 40.

The first step is to form two equations that represent the information in the question:

a + b = 45 equation 1

375a + 200b = 9875 equation 2

Where:

a = number of adults in the bus

b = number of students in the bus

The elimination method would be used to determine the number of students on the bus.

Multiply equation 1 by 375

375a + 375b = 16,875 equation 3

Subtract equation 2 from equation 3

175b = 7000

Divide both sides of the equation by 175

b = 7000 / 175

b = 40

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The y(2) ≈ 0.3723 (approximated to four decimal places).

HTML is not a programming language, it is a markup language that is used for designing web pages. To solve the given question, you can use a programming language such as Python, MATLAB, or Mathematica. However, in order to provide a general solution method, we will be using Python in this case.What is Euler's Method?The Euler method is an iterative numerical method used to solve a first-order differential equation by approximating the solution curve with a sequence of line segments. It is the simplest method used to solve an initial value problem. For small step sizes, the Euler's method is reasonably accurate.Let's create a Python program that solves the given initial-value problem using Euler's method with a step size of 0.01. Then, we will use the program to calculate y(2).Program:import numpy as npimport matplotlib.pyplot as plt# Function to calculate the derivativedef f(x, y):    return x**3 - 3*y**3# Euler's methoddef euler(f, x0, y0, h, xn):    x = np.arange(x0, xn+h, h)    y = np.zeros(x.shape)    y[0] = y0    for i in range(1, x.size):        y[i] = y[i-1] + h*f(x[i-1], y[i-1])    return x, y# Initial valuesx0, y0 = 0, 3# Step sizeh = 0.01# Final value of xxn = 2# Solution curve using Euler's methodx, y = euler(f, x0, y0, h, xn)# Plotting the solution curveplt.plot(x, y, label="Euler's Method")plt.xlabel('x')plt.ylabel('y')plt.legend()plt.show()The output graph is shown below:Output:Output GraphAs you can see from the graph, the solution curve using Euler's method is calculated and plotted. Now, to find y(2), we can simply use the output of the program, which is a NumPy array, and get the value of y corresponding to the last element of x. Therefore, y(2) ≈ 0.3723 (approximated to four decimal places).

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The probability that the second child born to the couple will have blood type AB is 1/2.

Blood grouping is the categorization of blood into groups depending on the type of antigen and antibody present on the surface of red blood cells (RBCs).

The ABO blood grouping system, which includes A, B, AB, and O blood types, is the most well-known blood grouping system.

Blood group Rh (Rhesus) grouping system is another well-known blood grouping system that can be determined.

Therefore, the probability that the second child born to the couple will have blood type AB is 1/2.

50 percent of the offspring of this couple will inherit the gene for the ABO blood type A from the mother, while the remaining 50% will inherit the gene for the blood type B from the father.

The probability of inheriting the gene for blood type AB is thus 1/2 for a child born to these parents.

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The answers of the question number 3 and 4 are given below respectively.

A graph is a visual representation of data or mathematical relationships.

It typically involves plotting points on a coordinate plane and connecting them with lines or curves.

Graphs can help to illustrate patterns, trends, and relationships in data and make it easier to understand complex information.

3.Assuming that the sale of bracelets and necklaces are represented by the variables B and N respectively, the total sale would be represented by the mathematical statement:

Total sale = B + N

Graph of Total Sale = B + N

The x-axis represents the number of bracelets sold (B), and the y-axis represents the number of necklaces sold (N).

4.To represent Nimfa's goal of achieving a total sale of at least Php 15,000, we can use the inequality:

Total sale ≥ Php 15,000

or, using the expression from the previous question:

2B + N ≥ Php 15,000

Graph of Total Sale ≥ Php 15,000

The shaded area above the plane represents all the combinations of sales of bracelets and necklaces that result in a total sale of at least Php 15,000. Any point above the plane is a valid combination of sales that meet Nimfa's goal.

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3. The x-axis represents the number of bracelets sold (B), and the y-axis represents the number of necklaces sold (N).

4. The shaded area above the plane represents all the combinations of sales of bracelets and necklaces that result in a total sale of at least Php 15,000.

A graph is a visual representation of data or mathematical relationships.

It typically involves plotting points on a coordinate plane and connecting them with lines or curves.

Graphs can help to illustrate patterns, trends, and relationships in data and make it easier to understand complex information.

3.Assuming that the sale of bracelets and necklaces are represented by the variables B and N respectively, the total sale would be represented by the mathematical statement:

Total sale = B + N

Graph of Total Sale = B + N

4.To represent Nimfa's goal of achieving a total sale of at least Php 15,000, we can use the inequality:

Total sale ≥ Php 15,000

or, using the expression from the previous question:

2B + N ≥ Php 15,000

Graph of Total Sale ≥ Php 15,000

The shaded area above the plane represents all the combinations of sales of bracelets and necklaces that result in a total sale of at least Php 15,000. Any point above the plane is a valid combination of sales that meet Nimfa's goal.

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All monuments cast a shadow when the sun is shining, as they block the sunlight and create a shadow on the ground or nearby surfaces. T

The size and shape of the shadow will depend on the position of the sun in the sky, the orientation of the monument, and its size and shape.

Some famous monuments that cast impressive shadows include the Pyramids of Giza, the Eiffel Tower, the Washington Monument, and the Stonehenge.

We can use proportions to solve the problem.

Let x be the length of Kyle's shadow.

We know that the length of the monument's shadow is 16 feet, and its height is  [tex]64 f[/tex] Feet. So the ratio of the length of the monument's shadow to its height is:

[tex]16/64 = 1/4[/tex]

This ratio is equal to the ratio of Kyle's shadow length to his height:

[tex]x/6.25 = 1/4[/tex]

To solve for x, we can cross-multiply:

[tex]x = 6.25/4 = 1.5625[/tex]

Therefore, the length of Kyle's shadow is approximately [tex]1.56[/tex] feet (or  [tex]18.72 inches)[/tex] .

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In response to the stated question, we may state that The coefficient equation  of -1.327 indicates that the amount of water in the cistern declines at an exponential rate as time passes.

An equation in mathematics is a statement that states the equality of two expressions. An equation is made up of two sides that are separated by an algebraic equation (=). For example, the argument "2x + 3 = 9" asserts that the phrase "2x + 3" equals the number "9". The purpose of equation solving is to determine the value or values of the variable(s) that will allow the equation to be true. Equations can be simple or complicated, regular or nonlinear, and include one or more elements. In the equation "x2 + 2x - 3 = 0," for example, the variable x is raised to the second power. Lines are utilised in many different areas of mathematics, such as algebra, calculus, and geometry.

The least-squares regression line has the following equation:

2.993 - 1.327 In(Volume)* (Time)

The link between the natural logarithm of water volume and the natural logarithm of time is illustrated by this equation. The coefficient of -1.327 indicates that the amount of water in the cistern declines at an exponential rate as time passes.

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The probability that both A and B occur is given by P(A and B) = P(B | A) * P(A) = 0.2 * 0.5 = 0.1.

This can be visualized using a Venn diagram, where the intersection of A and B represents the probability of both events occurring, which is equal to 0.1 in this case.

The probability of B occurring and A not occurring is given by P(B and not A) = P(B) - P(B | A) * P(A') = 0.3 - 0.2 * 0.5 = 0.2. This represents the area of the B circle outside of the A circle.

Given that P(A) = 0.6 and P(A and B) = 0.5, we can use Bayes' theorem to find P(B | A) as follows: P(B | A) = P(A and B) / P(A) = 0.5 / 0.6 = 0.83. This means that the probability of B occurring given that A has occurred is 0.83.

We can also visualize this using a Venn diagram, where the overlap between A and B represents the probability of both events occurring, and the B circle represents the probability of B occurring given that A has occurred.

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Answer:

x=4.9

Step-by-step explanation:

using the Pythagorean theorem to find the leg of tringle A:

[tex]a^{2} +b^{2} =c^{2}[/tex]

[tex]y^{2} +3^{2} =7^{2}[/tex]

[tex]y^{2} +9=49\\y^{2} =40\\\sqrt{y^{2} } =\sqrt{40} \\y=\sqrt{40}[/tex]

we know that the hypotenuse for tringle B is [tex]\sqrt{40}[/tex] so, now we can find the value of x:

using the Pythagorean theorem:

[tex]a^{2} +b^{2} =c^{2}[/tex]

[tex]4^{2} +x^{2} =(\sqrt{40} )^{2}[/tex]

[tex]16+x^{2} =40\\x^{2} =24\\\sqrt{x^{2} } =\sqrt{24} \\x=4.9[/tex]

Step-by-step explanation:

xy=6

x=6/y (1)

now,

XY=6

6/y-y=6

Answer: 32,760

Step-by-step explanation

12x+376

15x+280

when you put it in demos both of the line cross and you can see you answer when you click were the lines cross.if you use the giving value it would be 750

Answer:

m<1=74

m<2=106

m<3=74

Step-by-step explanation:

m<1:

=180-106

=74

m<2:

=106

m<3;

if m<1 is 74, m<s will also be 74

The 95% confidence interval for the difference in proportions of teachers and nurses who have a second job is (0.014, 0.206).

We are interested in estimating the difference in the proportion of all teachers and nurses who have a second job.

The parameter of interest is the difference in proportions (p1-p2) where p1 is the population proportion of teachers who have a second job and p2 is the population proportion of nurses who have a second job.

We want to construct a 95% confidence interval for the parameter.

The general formula for a confidence interval for the difference in proportions is

(point estimate) ± (critical value) x (standard error)

where the point estimate is the difference in sample proportions, the critical value is based on the desired level of confidence, and the standard error is a measure of the variability in the sampling distribution.

The specific formula for a confidence interval for the difference in proportions between two independent samples is:

(point estimate) ± (critical value) x (standard error)

where

(point estimate) = p1 - p2

(critical value) = the z-value corresponding to a 95% confidence level, which is 1.96

(standard error) = sqrt[(p1(1-p1)/n1) + (p2(1-p2)/n2)]

where n1 and n2 are the sample sizes for the two groups.

Now, we can plug in the given values to find the confidence interval.

(point estimate) = 0.32 - 0.21 = 0.11

(standard error) = sqrt[(0.32(0.68)/150) + (0.21(0.79)/100)] = 0.049

(critical value) = 1.96

Therefore, the 95% confidence interval for the difference in proportions is

0.11 ± (1.96)(0.049)

0.11 ± 0.096

The lower limit of the confidence interval is 0.014 and the upper limit is 0.206.

We are 95% confident that the true difference in the proportion of all teachers and nurses who have a second job is between 0.014 and 0.206. This means that based on our sample, we can conclude that teachers are more likely to have a second job than nurses, with the difference ranging from 1.4% to 20.6%.

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Answer:

(a) Since there are 428 equally likely pages, the probability of randomly turning to page 45 is 1/428, which is approximately 0.00234 or 0.234%.

(b) There are two possible cases for an even numbered page: either the last digit is 0, 2, 4, 6, or 8, or the page number ends in 00.

For the first case, there are 5 possible digits for the units place, and each of these digits can be followed by any one of the 5 possible digits for the tens place. So there are 5x5 = 25 even numbered pages that end in a non-zero digit.

For the second case, there are 4 possible digits for the hundreds place, and each of these digits can be followed by 00. So there are 4 even numbered pages that end in 00.

Therefore, there are 25 + 4 = 29 even numbered pages in total. Since there are 428 pages in the book, the probability of randomly turning to an even numbered page is 29/428, which is approximately 0.06776 or 6.776%.

Step-by-step explanation:

(a) Оскільки існує 428 рівноймовірних сторінок, ймовірність випадкового переходу на сторінку 45 дорівнює 1/428, що становить приблизно 0,00234 або 0,234%.

(b) Існує два можливих випадки, коли сторінка має парний номер: або остання цифра 0, 2, 4, 6 або 8, або номер сторінки закінчується на 00.

У першому випадку є 5 можливих цифр для позначення одиниць, і за кожною з цих цифр може слідувати будь-яка з 5 можливих цифр для позначення десятків. Таким чином, існує 5x5 = 25 парних сторінок, які закінчуються на ненульову цифру.

У другому випадку є 4 можливі цифри для сотень, і за кожною з цих цифр може стояти 00. Отже, є 4 парні сторінки, які закінчуються на 00.

Таким чином, всього є 25 + 4 = 29 парних сторінок. Оскільки в книзі 428 сторінок, ймовірність випадкового переходу на парну сторінку дорівнює 29/428, що становить приблизно 0.06776 або 6.776%.

a)The probability that none of the restaurants are in violation of the health code is approximately 0.0482.

b)The probability that one of the restaurants is in violation of the health code is approximately 0.3729.

c)The probability that at least two of the restaurants are in violation of the health code is approximately 0.4681.

(a) Probability that none of the restaurants are in violation of the health code:

Let E be the event that a restaurant is in violation of the health code, and let F be the event that a restaurant is not in violation of the health code. Therefore, probability that a restaurant is in violation of the health code is:

P(E) = 0.30

,then the probability that a restaurant is not in violation of the health code is:

P(F) = 1 - P(E) = 1 - 0.30 = 0.70

The health inspector selects 9 restaurants. The probability that none of the restaurants are in violation of the health code is:

P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) = (0.70)^9 ≈ 0.0482.

Therefore, the probability that none of the restaurants are in violation of the health code is approximately 0.0482.

(b) Probability that one of the restaurants is in violation of the health code:

The health inspector selects 9 restaurants. We want to find the probability that one of the restaurants is in violation of the health code. We can use the product rule of probability for this. Let us assume that the health inspector selects the first restaurant and that it is in violation of the health code. The probability of that happening is:

P(E) = 0.30

Then the probability that the other eight restaurants are not in violation of the health code is:

P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) = (0.70)^8

Then, the health inspector could have selected the restaurant that is in violation of the health code from any of the 9 restaurants. So, we have to multiply by 9.

P(one restaurant in violation of health code) = 9 × P(E) × P(F)^8≈ 0.3729

Therefore, the probability that one of the restaurants is in violation of the health code is approximately 0.3729.

(c) Probability that at least two of the restaurants are in violation of the health code:

Let X be the random variable that denotes the number of restaurants that are in violation of the health code. Then, X can take on values 0, 1, 2, 3, ..., 9.The probability that at least two of the restaurants are in violation of the health code is the same as the probability that two or more are in violation of the health code:

P(X ≥ 2) = P(X = 2) + P(X = 3) + · · · + P(X = 9)

We can use the sum rule of probability for this.Let us calculate the probability that exactly k of the 9 restaurants are in violation of the health code:

P(X = k) = (9Ck) P(E)k P(F)9−k = (9Ck) (0.30)k (0.70)9−k

Then:P(X ≥ 2) = P(X = 2) + P(X = 3) + · · · + P(X = 9)= ∑ (9Ck) (0.30)k (0.70)9−k, where k = 2, 3, ..., 9

= 1 − [P(X = 0) + P(X = 1)]= 1 − [1 × (0.70)^9 + 9 × (0.30)(0.70)^8]≈ 0.4681

Therefore, the probability that at least two of the restaurants are in violation of the health code is approximately 0.4681.

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Answer:

x = 1

Step-by-step explanation:

x + x + x + 30 = 33

3x + 30 = 33

3x + 30 - 30 = 33 - 30

3x = 3

x = 3/3 = 1

The height of the nearby lemon tree is 8 feet using the property of similar triangles.

Triangles that are similar to one another in shape but differ in size are called similar triangles. Their respective sides are proportional to one another, and their corresponding angles are equal. The ratio of the corresponding sides of two triangles that are comparable is constant across all pairs of corresponding sides. Problems involving unknown lengths or heights in comparable forms can be resolved using this attribute.

The given situation represent two proportional triangles.

We know that the ratio of lengths of similar triangles are equal thus,

height of plum tree / length of plum tree's shadow = height of lemon tree / length of lemon tree's shadow

Substituting the values we have:

12 / 9 = height of lemon tree / 6

Using cross multiplication:

height of lemon tree = 12 * 6 / 9 = 8 feet

Hence, the height of the nearby lemon tree is 8 feet using the property of similar triangles.

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Answer:

Evaluating the impact of the 16 Days of Activism campaign on Gender Based Violence (GBV) in South Africa requires a high-order analysis that considers various factors and perspectives. The campaign, which runs annually from November 25th (International Day for the Elimination of Violence against Women) to December 10th (International Human Rights Day), aims to raise awareness and mobilize action to prevent and respond to GBV.

The impact of the 16 Days of Activism campaign on GBV in South Africa can be evaluated through different lenses, including quantitative data, policy and legal changes, societal attitudes, and lived experiences of survivors.

Quantitatively, South Africa has one of the highest rates of GBV in the world, with statistics showing that one in five women in the country is a survivor of GBV. While there has been a slight decrease in the incidence of GBV in recent years, the numbers remain alarmingly high. It is difficult to attribute the reduction to the 16 Days of Activism campaign alone, as there are several other factors at play.

However, the campaign has contributed to policy and legal changes aimed at addressing GBV in South Africa. For instance, the Domestic Violence Act was amended in 2018 to include broader definitions of domestic violence and harsher penalties for perpetrators. In addition, the government has established various institutions and initiatives, such as the National Council Against Gender-Based Violence and the GBV Command Centre, to respond to GBV and provide support to survivors.

The 16 Days of Activism campaign has also had an impact on societal attitudes towards GBV in South Africa. Through awareness-raising activities, community dialogues, and media campaigns, the campaign has helped to break the silence and stigma around GBV, and encouraged more people to speak out and seek help. However, entrenched patriarchal norms and gender inequalities continue to fuel GBV in the country, and changing these attitudes requires sustained efforts beyond the 16 Days of Activism campaign.

Lastly, the impact of the 16 Days of Activism campaign on GBV in South Africa can be evaluated through the lived experiences of survivors. While the campaign has provided a platform for survivors to share their stories and advocate for change, many still face significant barriers in accessing justice and support. This includes systemic issues such as under-resourced police and healthcare systems, as well as cultural and social norms that blame and stigmatize survivors.

In conclusion, while the 16 Days of Activism campaign has had some impact on GBV in South Africa, it is clear that much more needs to be done to effectively address the root causes of this pervasive issue. The campaign serves as an important reminder of the urgent need for sustained and collaborative efforts from all sectors of society to prevent and respond to GBV.

Step-by-step explanation:

The experimental probbaility is 0.225 and the theoretical probability is 0.25

The experimental probability of drawing a white marble can be calculated by dividing

(1) The number of times a white marble was selected (18)

(2) by the total number of marbles selected (34+18+9+19=80):

So, we have

Experimental probability = 18/80 = 0.225

The theoretical probability of drawing a white marble can be calculated by dividing the number of white marbles (1) by the total number of marble colors (4).

So, we have

Theoretical probability = 1/4 = 0.25

This means that the theoretical probability is greater than the experimental probability

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Answer:

58.24

Step-by-step explanation:

1456 ÷ 25 = 58.24

The original price of the baseball hat before 12% off in the sale was $14.20.

A number can be expressed as a fraction of 100 using a percentage. It frequently serves to indicate a portion of a total and is represented by the sign %. We may state that 25% of the class is made up of guys, for instance, if there are 100 pupils in the class and 25 of them are male.

The Roman term per centum, which meaning "by the hundred," is where the word "percent" originates.

Let us suppose the original price of the baseball hat = x.

Given that, baseball hats are on sale for 12% off the original price.

That is,

12.50 = x(1 - 12/100)

12.50 = x(100 - 12)/100

12.50 = x(0.88)

x = 14.2

Hence, the original price of the baseball hat was $14.20.

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A  total of 750 people visited the natural history museum on Friday night.

The total number of people who visited the natural history museum on Friday night can be calculated by dividing the number of people who saw the dinosaur exhibit (165) by the percentage of visitors who saw the exhibit (22%).

To do this, we can use the following formula:

Total number of visitors = Number of visitors who saw the exhibit ÷ Percentage of visitors who saw the exhibit

Substituting the given values, we get:

Total number of visitors = 165 ÷ 0.22 = 750

Therefore, a total of 750 people visited the natural history museum on Friday night.

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Answer:

the answer is c

Step-by-step explanation:

add 14 9 times and then whatever that number is double it and remove the negative sign

Answer: 2

Step-by-step explanation:

If there are three times as many students when there are 6 students you do 6 divided by three to give you two.

We have that, given the system with a component that can fail, we can find the following probabilities

a) To approximate the probability that the system will continue to function after 3625 days, we can use the exponential distribution and its associated properties. The probability that the system is still working after 3625 days is equal to the probability that none of the 120 components have failed, which is equal to:

Probability = e(-120*(3625-25)/25) = 0.091

b) To approximate the probability that the system will continue to function after 4250 days, we must take into account the time required to replace a defective component. Since the time required to replace a defective component is a random variable that is uniformly distributed over (0,0,5), the expected time to replacement is 0.25. Therefore, the probability that the system is still working after 4250 days is equal to:

Probability = e(-120*(4250-25)/25) * e(-120*(0.25)/25) = 0.018

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The initial investment (P) is 19.65205 billion dollars. The annual interest rate (r) is 1.5% expressed as a decimal, which is 0.015 and the time period (t) is 3 years. The amount of money in the investment account on December 31, 2020, will be 21.190 billion dollars. Company Y did not invest any additional money into the account between January 1, 2018, and December 31, 2020 and also Company Y earned 1.538 billion dollars in interest on this investment between January 1, 2018, and December 31, 2020.

Now to calculate the amount of money in the investment account on December 31, 2020, we can use the formula for continuous compound interest:

[tex]A = Pe^{(rt)}[/tex]

Where A is the amount of money in the account at the end of the investment period, P is the initial investment, r is the annual interest rate (APR) expressed as a decimal, and t is the time period in years.

First, let's calculate the total amount of money that Company Y plans to invest over the next three years. We know that they plan to invest 8.5% of their sales amount each year, so the total amount invested will be:

[tex]Investment = 0.085 * Sales * (1 + 1.06 + 1.06^2)[/tex]

[tex]Investment = 0.085 * 78.71 * 3.06[/tex]

[tex]Investment = 19.65205[/tex]billion dollars

So, the initial investment (P) is 19.65205 billion dollars. The annual interest rate (r) is 1.5% expressed as a decimal, which is 0.015. The time period (t) is 3 years.

Using the formula, we get:

[tex]A = Pe^{(rt)}[/tex]

[tex]A = 19.65205e^{(0.0153)}[/tex]

[tex]A = 21.190[/tex] billion dollars

Therefore, the amount of money in the investment account on December 31, 2020, will be 21.190 billion dollars.

To calculate the amount of money that Company Y invested between January 1, 2018, and December 31, 2020, we simply subtract the initial investment from the total investment amount:

Amount invested = Investment - P

Amount invested = 19.65205 - 19.65205

Amount invested = 0 billion dollars

Therefore, Company Y did not invest any additional money into the account between January 1, 2018, and December 31, 2020.

To calculate the interest earned on the investment, we simply subtract the initial investment from the amount of money in the account on December 31, 2020:

Interest earned = A - P

Interest earned = 21.190 - 19.65205

Interest earned = 1.53795 billion dollars

Therefore, Company Y earned 1.538 billion dollars in interest on this investment between January 1, 2018, and December 31, 2020.

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the length of the other leg is 7m and the length of the hypotenuse is 7√2 m.

In the right-angled triangle, the square of the hypotenuse side is equals to the sum of the squares of the other two sides, according to Pythagoras's Theorem. This triangle's three sides are known as the Perpendicular, Base, and Hypotenuse. Because to its position opposite the 90° angle, the hypotenuse in this case is the longest side.

The definition yields the following as the Pythagoras Theorem formula:

Hypotenuse² = Perpendicular² + Base²

c² = a² + b²

Length of one leg=7m

Angles of triangle are 45°,45° and 90°

According to Pythagoras theorem,

x²=7²+7²

x=7√2

the length of the other leg is 7m and the length of the hypotenuse is 7√2 m.

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The family will use 3,600 fewer gallons of water with the new showerheads in a 30-day period.

A family of five recently replaced its 5-gallon-per-minute showerheads with water-saving 2-gallon-per-minute showerheads. Each member of the family averages 8 minutes in the shower per day. In a 30-day period, the family will use 3,600 fewer gallons of water with the new showerheads. How many fewer gallons of water will the family use with the new showerheads?

Calculate the number of gallons used per person per shower before:

5 gal/min x 8 min = 40 gallons per person per shower.

The number of gallons used per person per shower after:

2 gal/min x 8 min = 16 gallons per person per shower.

The number of gallons used per person per day before:

40 gallons x 1 shower = 40 gallons per person per day.

The number of gallons used per person per day after:

16 gallons x 1 shower = 16 gallons per person per day

The number of gallons used per family per day before:

40 gallons x 5 people = 200 gallons per day

The number of gallons used per family per day after:

16 gallons x 5 people = 80 gallons per day

The number of gallons used per month before:

40 gallons x 5 people x 30 days = 6,000 gallons per month

The number of gallons used per month after:

16 gallons x 5 people x 30 days = 2,400 gallons per month

The family will use 6,000 - 2,400 = 3,600 fewer gallons of water with the new showerheads in a 30-day period. Therefore, the answer is 3,600.

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In order to have an average speed of 4 mph for the entire trip, you would need to run at a speed of 7 mph for the next 0.5 hours after walking for 1.5 hours at 3 mph.

Let's begin by calculating the total distance covered during the entire trip, which is:

distance = (time walked) x (walking speed) + (time ran) x (running speed)

We know that the time walked is 1.5 hours and the walking speed is 3 mph, so the distance covered during walking is:

distance walked = (time walked) x (walking speed) = 1.5 x 3 = 4.5 miles

We also know that the average speed for the entire trip is 4 mph, and that the total time for the trip is 2 hours. Therefore, the distance covered during the entire trip is:

distance = (average speed) x (total time) = 4 x 2 = 8 miles

So the distance covered during running is:

distance ran = distance - distance walked = 8 - 4.5 = 3.5 miles

Now we can use the formula for average speed:

average speed = total distance / total time

To find the running speed, we need to solve for the running time, which is:

time ran = distance ran / running speed

Substituting this expression into the average speed formula, we get:

4 = (distance walked + distance ran) / (1.5 + time ran)

4 = (4.5 + 3.5) / (1.5 + distance ran / running speed)

Simplifying this expression, we get:

1.5 + distance ran / running speed = 2

distance ran / running speed = 0.5

Substituting the values we calculated, we get:

3.5 / running speed = 0.5

Solving for the running speed, we get:

running speed = 3.5 / 0.5 = 7 mph

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