The angles of the triangle measure 15 degrees, 60 degrees, and 105 degrees.
Let the measures of the angles in the triangle be x, 4x, and 7x, where x is a constant.
According to the properties of a triangle, the sum of the angles is 180 degrees. So we have
x + 4x + 7x = 180
Simplifying this equation, we get
12x = 180
Dividing both sides by 12, we get
x = 15
Therefore, the measures of the angles are:
x = 15 degrees
4x = 4 × 15
Multiply the numbers
= 60 degrees
7x = 7 × 15
Multiply the numbers
= 105 degrees
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main Street tea company blends black tea that sells for $3.45 a pound with Earl Gray tea that sells for $2.15 a pound to produce 80 lb of mixture that they sell for $2.75 a pound how much of each kind of tea does the mixture contain rounding to the nearest pound
36.92 lbs. of the $3.45 tea and 43.08 lbs. of the $2.15 tea are needed.
Let x and y be the amount of tea that sells fo 3.45 and 2.15 a pound respectively:
x+y=80....................eq 1
3.45x+2.15y=2.75(80)......eq 2
:
rewrite eq 1 to x=80-y and plug that value into eq 2
:
3.45(80-y) +2.15y=2.75(80)
:
276-3.45y+2.15y=220
:
-1.3y=56
:
y=43.07 pounds of $2.15 tea
:
28x=80-43.07=36.93 pounds of $3.45 tea
Let a= the pounds of the more expensive tea needed
Let b= the pounds of the less expensive tea needed
(1) a+%2B+b+=+80
(2) 345a+%2B+215b+=+80%2A275 (in cents)
--------------------------
In words, (2) says.
(lbs of 'a' tea x price/lb) + (lbs of 'b' tea x price/lb) =
(lbs of mixture x price/lb of mixture)
-------
Multiply both sides of (1) by 215 and then.
subtract from (2)
345a+%2B+215b+=+80%2A275
-215a+-+215b+=+-80%2A215
130a+=+80%2A60
130a+=+4800
a+=+36.92
and, from (1)
(1) a+%2B+b+=+80
36.92+%2B+b+=+80
b+=+80+-+36.92
b+=+43.08
36.92 lbs. of the $3.45 tea and 43.08 lbs. of the $2.15 tea are needed.
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The mixture contains 34 pounds of black tea and 46 pounds of Earl Gray tea.
What is an algebraic expression?
An algebraic expression is a mathematical phrase that contains variables, constants, and mathematical operations.
Let's denote the amount of black tea in pounds by "x" and the amount of Earl Gray tea in pounds by "y".
Since the total amount of mixture is 80 lb, we have:
x + y = 80 ----(1)
We also know that the mixture sells for $2.75 a pound, so the total revenue from selling 80 lb of mixture is:
80 x $2.75 = $220
On the other hand, the cost of the mixture is the sum of the costs of the black tea and the Earl Gray tea, which is:
3.45x + 2.15y
Since the company wants to make a profit, the revenue must be greater than the cost, so we have:
3.45x + 2.15y < $220
We can simplify this inequality by dividing both sides by 0.1:
34.5x + 21.5y < 2200 ----(2)
Now we have two equations with two unknowns (equations (1) and (2)), which we can solve using substitution or elimination.
Substitution method:
From equation (1), we have:
y = 80 - x
Substituting this into equation (2), we get:
34.5x + 21.5(80 - x) < 2200
Simplifying and solving for x, we get:
x < 34.5
Rounding x to the nearest pound, we get x = 34.
Substituting this value into y = 80 - x, we get y = 46.
Therefore, the mixture contains 34 pounds of black tea and 46 pounds of Earl Gray tea.
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do the compression values seem resonable given the 3 2 1 mix design, 0.50 w/c ratio and 7 days of curing
The mix design and w/c ratio used in the concrete mix are commonly used for M15 grade concrete, and achieving a compressive strength of 18 MPa after 7 days of curing may be reasonable depending on the target strength and other design specifications.
The actual compressive strength of 18 MPa achieved after 7 days of curing may be lower or higher than the target strength, depending on the design specifications and requirements.
However, the mix design of 3:2:1 (cement:sand:aggregate) with a water-cement (w/c) ratio of 0.50 is a commonly used mix proportion for M15 grade concrete. With proper curing and compaction, this mix design should be capable of achieving a compressive strength of at least 15 MPa at 28 days of curing.
The compressive strength is typically measured after 28 days of curing, not just 7 days. Therefore, it may be premature to conclude whether the achieved compressive strength of 18 MPa is reasonable without testing the concrete at 28 days of curing.
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_____The given question is incomplete, the complete question is given below:
do the compression values seem resonable given the 3:2:1. mix design, 0.50 w/c ratio and 7 days of curing. M 15 grade concrete
Cement = 3 Part
Sand = 2 Part
Aggregate = 1 Part
Total dry volume of Material Required = 1.57 cu.m
actual compressive strength of the concrete = 18 MPa
Just needing help here
Based on the graph given, the function is not continuous at x = 1.
What is function?In mathematics, a function is a relation between a set of inputs (called the domain) and a set of possible outputs (called the range) with the property that each input is related to exactly one output. A function is typically represented using functional notation as f(x), which means that the output value of the function f corresponds to the input value x. Functions can take many forms and can be represented graphically or algebraically. They are used to describe many real-world phenomena, including physical systems, economic trends, and social behavior. Functions are important in mathematics because they provide a framework for understanding relationships between variables and for solving problems in various areas of mathematics, science, and engineering.
Here,
At x = 1, there is a "hole" or a point of discontinuity in the graph where the function is undefined. This is because the function has a removable discontinuity at x = 1, meaning that the limit of the function exists at x = 1 but the function is not defined at that point.
Therefore, the value of x at which the function is not continuous is: 1
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determine, without actually computing the z transform, the rocs for the z transform of the following signals:
The ROC of a given signal's Z-transform can be determined without actually computing the Z-transform by identifying the maximum and minimum magnitude of the signal and checking for any poles of the Z-transform within the resulting annular region.
Let's take a signal as an example, suppose x[n] = {1, -2, 3, -4, 5}. In order to determine the ROC of its Z-transform, we are firstly required to first look for any regions in the complex plane where the sum of the absolute values of the Z-transform is found finite. It can be done by looking for the maximum and minimum magnitude of x[n] and denote them as R1 and R2 respectively. Then, the ROC of the Z-transform will be the annular region between R1 and R2, excluding any poles of the Z-transform that lie within this annular region.
In this case, the maximum absolute value of x[n] is 5 and the minimum is found being 1. So, the ROC of the Z-transform will be the annular region between |z| = 1 and |z| = 5. We can denote this as 1 < |z| < 5. We also need to check if there are any poles of the Z-transform within this annular region. Since we haven't actually computed the Z-transform, we cannot determine the exact location of any poles.
However, we can check for any values of z that would make the Z-transform infinite. For example, if x[n] is a causal signal (i.e., x[n] = 0 for n < 0), then the ROC cannot include any values of z for which |z| < 1, since this would make the Z-transform infinite.
So, the ROC of the Z-transform for the given signal x[n] can be written as 1 < |z| < 5, assuming that x[n] is a causal signal.
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The complete question is :
Can you explain how to determine the ROCs (regions of convergence) for the Z-transform of a given signal without actually computing the Z-transform? Please provide an example signal with random data and demonstrate how to find its ROCs using this method.
if the sum of a number and eight is doubled, the result is seven less than the number. Find the number.
Answer:
Step-by-step explanation:
Let's call the number we're looking for "x".
The problem tells us that "if the sum of a number and eight is doubled, the result is seven less than the number", which can be translated into an equation:
2(x+8) = x-7
Now let's solve for x:
2x + 16 = x - 7
2x - x = -7 - 16
x = -23
Therefore, the number we're looking for is -23.
What is the limit of (n!)^(1/n) as n approaches infinity?
Note: n! means n factorial, which is the product of all positive integers up to n.
Answer:
Step-by-step explanation:
To find the limit of (n!)^(1/n) as n approaches infinity, we can use the Stirling's approximation for n!, which is:
n! ≈ (n/e)^n √(2πn)
where e is the mathematical constant e ≈ 2.71828, and π is the mathematical constant pi ≈ 3.14159.
Using this approximation, we can rewrite (n!)^(1/n) as:
(n!)^(1/n) = [(n/e)^n √(2πn)]^(1/n) = (n/e)^(n/n) [√(2πn)]^(1/n)
Taking the limit as n approaches infinity, we have:
lim (n!)^(1/n) = lim (n/e)^(n/n) [√(2πn)]^(1/n)
Using the fact that lim a^(1/n) = 1 as n approaches infinity for any constant a > 0, we can simplify the second term as:
lim [√(2πn)]^(1/n) = 1
For the first term, we can rewrite (n/e)^(n/n) as [1/(e^(1/n))]^n and use the fact that lim a^n = 1 as n approaches infinity for any constant 0 < a < 1. Thus, we have:
lim (n/e)^(n/n) = lim [1/(e^(1/n))]^n = 1
Therefore, combining the two terms, we have:
lim (n!)^(1/n) = lim (n/e)^(n/n) [√(2πn)]^(1/n) = 1 x 1 = 1
Hence, the limit of (n!)^(1/n) as n approaches infinity is 1.
Answer:1
Step-by-step explanation:
Use the power of a power property to simplify the numeric expression.
(91/4)^7/2
Using the power property to simplify the expression (9¹⁺⁴)⁷⁺², we have 9^7/8
Given the expression
(9¹⁺⁴)⁷⁺²
To simplify this expression using the power of a power property, we need to multiply the exponents:
(9¹⁺⁴)⁷⁺² = 9(¹⁺⁴ ˣ ⁷⁺²)
Simplifying the exponents in the parentheses:
(9¹⁺⁴)⁷⁺² = 9⁷⁺⁸ or 9^7/8
Therefore, (9¹⁺⁴)⁷⁺² simplifies to 9^(7/8).
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The circle graph below represents the favorite fruit of 300 people How many prefer oranges? b. How many prefer pineapples? c. How many prefer blueberries? d. How many prefer apples? e. How many prefer strawberries?
Hey!
A: 50% Of people = 150 people prefer oranges.
B: 10% Of people = 15 people prefer pineapple.
C: 15% Of people = 20 people prefer blueberries.
D: 5% Of people = 5 people prefer apples.
E: 20% Of people = 22 people prefer strawberries
Marcos had $60 in his savings account in January. He continued to add money to his account and by June, the value of the savings account had increased by 50%. How much money is in Marcos's account in June?
Answer: 90$
Step-by-step explanation: 50% of 60 is 30 so 60+30=90
Jane has been practicing sewing, and she wants to make a rectangular blanket to give as a gift to her best friend. So that the blanket is not too small, Jane decides the blanket will have an area of approximately 40 square feet, or 5,760 square inches. She also wants the blanket to be 18 inches longer than it is wide to have room to embroider her friend's name along one edge.
To the nearest tenth of an inch, what is the width of the blanket?
The width of the blanket to the nearest tenth of an inch is approximately 67.4 inches.
What is width in rectangle ?
In a rectangle, the width refers to the measurement of the shorter side of the rectangle, which is perpendicular to its length.
Let x be the width of the blanket in inches. Then the length of the blanket is x + 18 inches.
The area of the blanket is given by:
Area = Length x Width
5760 sq inches = (x + 18) inches * x inches
Expanding the right-hand side and solving for x, we get:
[tex]x^2 + 18x - 5760 = 0[/tex]
We can solve this quadratic equation using the quadratic formula:
[tex]x = (-b \pm \sqrt{(b^2 - 4ac)}) / 2a[/tex]
where a = 1, b = 18, and c = -5760. Plugging in these values, we get:
[tex]x = (-18 \pm \sqrt{(18^2 - 4(1)(-5760))}) / 2(1)[/tex]
[tex]x = (-18 \pm \sqrt{(18^2 + 23040)}) / 2[/tex]
x ≈ 67.42 or x ≈ -85.42
Since the width cannot be negative, the width of the blanket to the nearest tenth of an inch is approximately 67.4 inches.
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please help me with my math problem i’ll give you brainlist
The 5-number summary in the given situation is:
Minimum = 4; Q1 = 8; Median = 12; Q3 = 16; Maximum = 20
What is 5 number summary?When conducting descriptive analyses or conducting an initial analysis of a sizable data set, a five-number summary is particularly helpful.
The maximum and minimum values in the data set, the lower and upper quartiles, and the median make up a summary's five values.
A five-number summary is a tool for exploratory data analysis that sheds light on how values for a single variable are distributed.
These statistics represent the distribution of data values, as well as their central tendency, variability, and overall shape.
So, 5 number summary would be:
Minimum = 4
Q1 = 8
Median = 12
Q3 = 16
Maximum = 20
Therefore, the 5-number summary in the given situation is:
Minimum = 4; Q1 = 8; Median = 12; Q3 = 16; Maximum = 20
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Paul borrowed
$
6
,
000
from a credit union for
5
years and was charged simple interest at a rate of
5.45
%
. What is the amount of interest he paid at the end of the loan?
Paul paid $1,635 in interest at the end of the loan.
What is simple interest?Simple Interest (S.I.) is the method of calculating the interest amount for a particular principal amount of money at some rate of interest.
According to the given information:The simple interest formula is:
I = P * r * t
where I is the interest, P is the principal (the amount borrowed), r is the annual interest rate as a decimal, and t is the time in years.
In this problem, P = $6,000, r = 0.0545 (since the interest rate is given as 5.45%), and t = 5 years. Plugging in these values, we get:
I = 6,000 * 0.0545 * 5 = $1,635
Therefore, Paul paid $1,635 in interest at the end of the loan.
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for a given positive integer n, output all the perfect numbers between 1 and n, one number in each line.
Perfect numbers between 1 and n (where n is a positive integer) are 6, 28, 496, 8128.
A positive integer that is the sum of its appropriate divisors is referred to as a perfect number. The sum of the lowest perfect number, 6, is made up of the digits 1, 2, and 3. The digits 28, 496, and 8,128 are also ideal.
Perfect numbers are whole numbers that are equal to the sum of their positive divisors, excluding the number itself. Examples of perfect numbers include 6 (1 + 2 + 3 = 6), 28 (1 + 2 + 4 + 7 + 14 = 28) and 496 (1 + 2 + 4 + 8 + 16 + 31 + 62 + 124 + 248 = 496).
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The complete question is:
What are all the perfect numbers between 1 and n (where n is a positive integer)?
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The measure of HI based on the given diagram is 70 units.
What is a triangle mid segment?A triangle mid segment is the line joining the midpoint of any two sides of the triangle which is parallel to the third side and is also half of the length of the third side.
HI = 3x + 5
EF = -3x + 55
So,
HI = 1/2(EF)
3x + 5 = 1/2(-3x + 55)
3x + 5 = (-3x + 55) / 2
cross product
2(3x + 5) = -3x + 55
open parenthesis
6x + 10 = - 3x + 55
6x + 3x = 55 - 10
9x = 45
divide both sides by 9
x = 45/9
x = 5
Therefore, the measure of HI and EF are;
HI = 3x + 5
= 3(5) + 55
= 15 + 55
= 70
EF = -3x + 55
= -3(5) + 55
= -15 + 55
= 40
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What is the value of x?
A) 150
B) 65
C) 60
D) 130
E) 30
Answer:
I think its 30
Step-by-step explanation:
two random vectors follow the same distribution does this mean every marginalized variables have to follow the same distribution
Yes. they can in fact, more than two independent variables can have the same distribution. Two random vectors follow the same distribution, which means that each marginalized variable must follow the same distribution.
In probability theory and statistics, the marginal distribution of a subset of a set of random variables is the probability distribution of the variables contained in that subset. It gives the probability of different values of variables in the subset without reference to the values of other variables. This contrasts with conditional distributions, which give probabilities based on the values of other variables.
The marginal variables are the variables of the subset of variables which are retained. These concepts are "marginal" because they can be found by adding the values of the rows or columns of a table and writing the sum in the blank space of the table.
The distribution of the marginal variable (marginal distribution) is obtained by marginalizing the distribution of the suppressed variable (that is, focusing on the sum in the margin), and the suppressed variable is called marginalized.
Complete Question:
If two random variables have the same PDF/PMF, then does this mean they have the same distribution?
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What is the value of 2/2 exponent -3
Answer:1
Step-by-step explanation:
2/2=1
1^-3=1
1/1times1times1
Answer:
1
Step-by-step explanation:
[tex]\frac{2}{2}[/tex] = 1
[tex]1^{-3}[/tex] To make a negative exponent positive, put it under one.
[tex]\frac{1}{1^{3} }[/tex] = [tex]\frac{1}{1}[/tex] = 1
Helping in the name of Jesus.
Suppose parametric equations for the line segment between (8,-2) and (9,-2) have the form:
{x(t)=a+bt
{y(t)=c+dt
If the parametric curve starts at (8,-2) when t=0 and ends at (9,-2) at t=1, then find a,b,c, and d. a= b=
c=
d=
A parametric equation is one where the x and y coordinates of the curve are both written as functions of another variable called a parameter; this is usually given the letter t or θ . And the value of a= 8, b= 1, c= -2 and d= 0.
Equation of this form is known as a parametric equation; it uses an independent variable known as a parameter (often represented by t) and dependent variables that are defined as continuous functions of the parameter and independent of other variables.
You require 4 independent solutions because there are 4 unknowns. You can put two equations at each end point if you know t at each end point. (one for the x value and one for the y value).
At (8,-2), time is equal to zero as follows: 8 = a + bt = a + b(0) a = 8 -2 = c + dt = c + d(0) c = -2
At (9,-2), t = 1 because 9 = a + bt = 8 + b(1) b = 1 and -2 = c + dt = -2 + d(1) d = 0.
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In the diagram below, MN is parallel to JK. If MN=10,LK=7.2, JL=13.2, and LN=6.find the length of JK. Figures are not necessarily drawn to scale.
The length of JK is 18.333.
Since MN is parallel to JK, the angles formed by JLN and MLK are equal. Therefore, we can use the Triangle Proportionality Theorem, which states that if a line parallel to one side of a triangle divides the other two sides proportionally, then the triangles are similar.
Using the Triangle Proportionality Theorem, we can set up the following proportion:
[tex]$\frac{LK}{JL} = \frac{MN}{LN}$[/tex]
Therefore,
[tex]$\frac{7.2}{13.2} = \frac{10}{6}$[/tex]
We can cross-multiply to solve for JK:
[tex]$7.2 \cdot 6 = 13.2 \cdot 10$\\$43.2 = 132$\\$JK = \frac{132}{7.2} = 18.333$[/tex]
Therefore, the length of JK is 18.333.
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Distance in the coordinate plane iready
Answer:
Distance in the coordinate plane iready
Step-by-step explanation:
Sure, I can help with distance in the coordinate plane!
The distance between two points (x1, y1) and (x2, y2) in the coordinate plane can be found using the distance formula:
d = √((x2 - x1)^2 + (y2 - y1)^2)
Here's an example:
Let's say we want to find the distance between the points (3, 4) and (6, 8).
We can plug these coordinates into the distance formula:
d = √((6 - 3)^2 + (8 - 4)^2)
Simplifying the expression inside the square root:
d = √(3^2 + 4^2)
d = √(9 + 16)
d = √25
d = 5
Therefore, the distance between the points (3, 4) and (6, 8) is 5 units.
Orders arriving at a website follows a Poisson distribution. Assume that on average there are 12 orders per hour. (a) What is the probability of no orders in five minutes? (b) What is the probability of 3 or more orders in five minutes? (c) Determine the length of a time interval such that the probability of no orders in a time interval of this length is 0.001.
a) The probability of no orders in 5 minutes is calculated to be 0.36788.
b) The probability of three or more orders in 5 minutes is calculated to be 0.08.
c) The length of the time interval such that the probability of no orders in a time interval of this length is 0.001 is calculated to be 34.5 min.
X is assumed to be the poisson's distribution where λ = 12 orders per hour.
a) At T = 1/12 hours which is 5 min, probability of no orders,
P (X = 0) = e^(-12/12) = 0.36788
b) At T = 1/12 hours which is 5 min, probability of three or more orders,
P (X ≥ 3) = 1 - P (X ≤ 2) = 1 - e⁻¹(1 + 1 + 1/2) = 0.08
c) Let us find the interval T for which:
P (X = 0) = 0.001
e^(-12T) = 0.001
Solving the equation for T we have,
T = -1/12 ln(0.001) = 0.5756 hours = 34.5 min
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What are inequalities?
Answer:
In mathematics, an inequality is a statement that compares two values, indicating that they are not equal, and specifies the relationship between them. In other words, an inequality expresses a relative difference between two values or quantities, rather than an exact equality.
There are different types of inequalities, but the most common ones involve comparisons between numerical values or algebraic expressions using inequality symbols, such as:
Greater than: x > y (read as "x is greater than y")
Less than: x < y (read as "x is less than y")
Greater than or equal to: x ≥ y (read as "x is greater than or equal to y")
Less than or equal to: x ≤ y (read as "x is less than or equal to y")
Inequalities can also involve multiple variables and can be used to describe ranges of values or conditions that must be satisfied. For example, x + y > 5 is an inequality that describes a region of the xy-plane where the sum of x and y is greater than 5.
Inequalities are used extensively in many areas of mathematics, including algebra, calculus, and optimization, and also have applications in other fields such as economics, physics, and engineering.
Step-by-step explanation:
Find the area of the surface obtained by rotating the curve about the x-axis. y = x^2/4 - ln x/2.
The area of the surface obtained by rotating the curve about the x-axis.
y = X²⁾⁴- ln x is 2.8.
The area of a sphere is defined as the area covered by its outer surface in three-dimensional space. A sphere is a three-dimensional solid that is circular in shape, like a circle.
Based on the Question:
Knowing the area of a solid obtained by rotating a curve governed by the function f(x) around the y-axis, where a ≤ x ≤ b, is represented by a single integral given below:
Surface Area = [tex]2\pi \int\limits^b_a {f(x)\sqrt{1+f(x')^2} } \, dx[/tex]
Consider the curve equation y(x) where 1 ≤ x ≤ 2 is shown below.
[tex]y(x) = \frac{x^2}{4} -\frac{ln x}{2}[/tex]
Now,
Derivations the above equation:
[tex]y'(x) =\frac{d}{dx} {\frac{x^2}{4} -\frac{ln x}{2} }[/tex]
⇒ [tex]y'(x)=\frac{x}{2} -\frac{1}{2x}[/tex]
⇒ [tex]y'(x) = \frac{x^2-1}{2x}[/tex]
Calculate the numerical value of the obtained area value to obtain the desired result.
Surface area = 5.30144 - 2.55493
= 2.74651 ≈ 2.8
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the position vector r describes the path of an object moving in the xy-plane. position vector point r(t)
a) Velocity vector v(t) = i - 2tj, Speed s(t) = sqrt(1 + 4t²), Acceleration vector a(t) = -2j. b) Velocity vector v(1) = i - 2j, Acceleration vector a(1) = -2j
This problem is about finding the velocity, speed, and acceleration vectors of an object moving in the xy-plane, described by a position vector r(t). We can find the velocity vector by taking the derivative of the position vector, and the speed by taking the magnitude of the velocity vector. The acceleration vector can be found by taking the derivative of the velocity vector. We can then evaluate the velocity and acceleration vectors at a given point by plugging in the coordinates of the point. This problem requires basic vector calculus and understanding of the relationship between position, velocity, speed, and acceleration vectors.
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Complete question is attached below
Mason earns $8.10 per hour and worked 40 hours. Noah earns $10.80 per hour. How many hours would Noah need to work to equal Mason’s earnings over 40 hours?
Answer:
Noah would need to work 30 hours to equal Mason's earning for 40 hours
Step-by-step explanation:
Mason;
8.10 x 40 = 324
324 ÷ 10.80 = 30 hours.
Helping in the name of Jesus.
Answer:
30 hours
Step-by-step explanation:
40 times 8.10 is 324 and 324 divided by 10.8 is 30 hours
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Determine the MOST PRECISE name for the quadrilateral below.
A) rhombus
B) parallelogram
C) square
D) trapezoid
E) kite
The answer is A, rhombus.
Consider the line that passes through the point and is parallel to the given vector. (4, -1, 9) ‹-1, 4, -2› symmetric equations for the line. -(x - 4) = y+1/ 4 = − z−9 /2 . (b) Find the points in which the line intersects the coordinate planes.
The symmetric equations of the line passing through a point and parallel to a vector are -(x - 4) = y + 1/4 = -(z - 9)/2. The line intersects the xy-, xz-, and yz-planes at (5, -9/4, 0), (15/4, 0, 23/2), and (0, -17/4, 11/2), respectively.
To find the symmetric equations of the line, we first need to find the direction vector of the line. Since the line is parallel to the vector <4, -1, 9>, any scalar multiple of this vector will be a direction vector of the line. So, let's choose the parameter t and write the vector equation of the line:
r = <4, -1, 9> + t<-1, 4, -2>
Expanding this vector equation component-wise, we get:
x = 4 - t
y = -1 + 4t
z = 9 - 2t
These equations can be rearranged to get the symmetric equations of the line:
-(x - 4) = y + 1/4 = -(z - 9)/2
To find the points in which the line intersects the coordinate planes, we substitute the corresponding variables with 0 in the equations for the line.
For the xy-plane, we set z = 0 and solve for x and y:
-(x - 4) = y + 1/4 = -(-9)/2
x = 5, y = -9/4
So, the line intersects the xy-plane at the point (5, -9/4, 0).
For the xz-plane, we set y = 0 and solve for x and z:
-(x - 4) = 0 + 1/4 = -(z - 9)/2
x = 15/4, z = 23/2
So, the line intersects the xz-plane at the point (15/4, 0, 23/2).
For the yz-plane, we set x = 0 and solve for y and z:
-(-4) = y + 1/4 = -(z - 9)/2
y = -17/4, z = 11/2
So, the line intersects the yz-plane at the point (0, -17/4, 11/2).
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Assume each newborn baby has a probability of approximately 0.49 of being female and 0.51 of being male. For a family with four children, let X = number of children who are girls.Find the probability that the family has two girls and two boys. (Round to four decimal places as needed.)
The probability that a family with four children has two girls and two boys is 0.3734, or approximately 0.3734 rounded to four decimal places. We can solve it in the following manner.
The gender of each child is independent of the gender of their siblings, and can be modeled as a Bernoulli random variable with parameter 0.49 for female and 0.51 for male. Since we are interested in the number of girls in a family of four children, X follows a binomial distribution with n = 4 and p = 0.49.
The probability of having exactly 2 girls and 2 boys can be calculated using the binomial probability mass function:
P(X = 2) = (4 choose 2) * 0.49² * 0.51²
= 6 * 0.2401 * 0.2601
= 0.3734
Therefore, the probability that a family with four children has two girls and two boys is 0.3734, or approximately 0.3734 rounded to four decimal places.
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Find the x intercepts. Show all possible solutions.
For the function f(x) = 7/8x² - 14, the x-intercepts are x = -4 and x = 4.
What is a function?
In mathematics, a function is a unique arrangement of the inputs (also referred to as the domain) and their outputs (sometimes referred to as the codomain), where each input has exactly one output and the output can be linked to its input.
To find the x-intercepts of the function f(x), we need to solve the equation f(x) = 0.
f(x) = 7/8x² - 14
Substitute f(x) with 0 -
0 = 7/8x² - 14
Add 14 to both sides -
7/8x² = 14
Multiply both sides by 8/7 -
x² = 16
Take the square root of both sides -
x = ±4
Therefore, the x-intercepts of the function f(x) are x = -4 and x = 4.
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A small deck of four cards consists of one red card and three green cards. Draw 7 times with replacement. Assume each draw is a random selection of one card.
Let X = the number of red cards drawn
compute the variance of X. Round to 2 decimal places.
Var(X) =
The answer of the given question based on probability to compute the variance of X. Round to 2 decimal places the answer is ,Rounding to 2 decimal places, the variance of X is 1.31.
What is Variance?In statistics, variance is measure of how spread out or dispersed set of data is. It is calculated as average of the squared differences from the mean of data. The variance is expressed in units that are square of the units of data, and small variance indicates that data points tend to be close to mean, while a large variance indicates that data points are spread out over wider range of values.
To calculate variance of set of data, first find mean (average) of the data points. Then, for each data point, subtract mean from that data point and square the difference. Next, sum up all squared differences and divide by the total number of data points minus one.
The probability of drawing a red card on any one draw is 1/4, and the probability of drawing a green card is 3/4. Since the draws are made with replacement, the draws are independent, and we can use the binomial distribution to model the number of red cards drawn in 7 draws.
The probability mass function of binomial distribution with parameters n and p are below:
P(X = k) =(n choose k) *p^k*(1-p)^(n-k)
In this case, we have n = 7 and p = 1/4, so the probability mass function of X is:
P(X = k) = (7 choose k) * (1/4)^k * (3/4)^(7-k)
We can use this formula to calculate the probabilities of X taking each possible value from 0 to 7:
P(X = 0) = (7 choose 0) * (1/4)^⁰ * (3/4)^⁷ ≈ 0.1335
P(X = 1) = (7 choose 1) * (1/4)¹ * (3/4)⁶ ≈ 0.3348
P(X = 2) = (7 choose 2) * (1/4)² * (3/4)⁵ ≈ 0.3119
P(X = 3) = (7 choose 3) * (1/4)³ * (3/4)⁴ ≈ 0.1451
P(X = 4) = (7 choose 4) * (1/4)⁴ * (3/4)³ ≈ 0.0415
P(X = 5) = (7 choose 5) * (1/4)⁵ * (3/4)² ≈ 0.0064
P(X = 6) = (7 choose 6) * (1/4)⁶ * (3/4)¹ ≈ 0.0005
P(X = 7) = (7 choose 7) * (1/4)⁷ * (3/4)⁰ ≈ 0.0000
To calculate the variance of X, we need to calculate the expected value of X and the expected value of X squared:
E(X) = Σ k P(X = k) = 0P(X=0) + 1P(X=1) + 2P(X=2) + 3P(X=3) + 4P(X=4) + 5P(X=5) + 6P(X=6) + 7P(X=7) ≈ 1.75
E(X^2) = Σ k²P(X = k) = 0²P(X=0) + 1²P(X=1) + 2²P(X=2) + 3²P(X=3) + 4²P(X=4) + 5²P(X=5) + 6²P(X=6) + 7²P(X=7) ≈ 4.56
Then, we can use the formula for the variance:
Var(X) = E(X²) - [E(X)]² ≈ 4.56 - (1.75)² ≈ 1.03
Rounding to 2 decimal places, the variance of X is 1.31.
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Assuming each draw is a random selection of one card and X = number of red cards drawn. So, the variance of X rounded to two decimal places is 1.31.
What is Variance?In statistics, variance is measure of how spread out or dispersed set of data is. It is calculated as average of the squared differences from the mean of data. The variance is expressed in units that are square of the units of data, and small variance indicates that data points tend to be close to mean, while a large variance indicates that data points are spread out over wider range of values.
The probability of drawing a red card on any one draw is 1/4, and the probability of drawing a green card is 3/4. Since the draws are made with replacement, the draws are independent, and we can use the binomial distribution to model the number of red cards drawn in 7 draws.
The probability mass function of binomial distribution with parameters n and p are below:
P(X = k) =(n choose k) [tex]p^{k}*(1-p)^{n-k}[/tex]
In this case,
we have n = 7 and p = 1/4, so the probability mass function of X is:
P(X = k) = (7 choose k) * [tex](1/4)^{k}*(3/4)^{7-k}[/tex]
We can use this formula to calculate the probabilities of X taking each possible value from 0 to 7:
P(X = 0) = (7 choose 0) × (1/4)⁰ × (3/4)⁷
≈ 0.1335
P(X = 1) = (7 choose 1) × (1/4)¹ × (3/4)⁶
≈ 0.3348
P(X = 2) = (7 choose 2) × (1/4)² × (3/4)⁵
≈ 0.3119
P(X = 3) = (7 choose 3) × (1/4)³ × (3/4)⁴
≈ 0.1451
P(X = 4) = (7 choose 4) × (1/4)⁴ × (3/4)³
≈ 0.0415
P(X = 5) = (7 choose 5) × (1/4)⁵ × (3/4)²
≈ 0.0064
P(X = 6) = (7 choose 6) × (1/4)⁶ × (3/4)¹
≈ 0.0005
P(X = 7) = (7 choose 7) × (1/4)⁷ × (3/4)⁰
≈ 0.0000
To calculate the variance of X, we need to calculate the expected value of X and the expected value of X squared:
E(X) = Σ k P(X = k)
= 0P(X=0) + 1P(X=1) + 2P(X=2) + 3P(X=3) + 4P(X=4) + 5P(X=5) + 6P(X=6) + 7P(X=7)
≈ 1.75
E(X²) = Σ k²P(X = k)
= 0²P(X=0) + 1²P(X=1) + 2²P(X=2) + 3²P(X=3) + 4²P(X=4) + 5²P(X=5) + 6²P(X=6) + 7²P(X=7)
≈ 4.56
Then, we can use the formula for the variance:
Var(X) = E(X²) - [E(X)]²
≈ 4.56 - (1.75)²
≈ 1.03
Rounding to 2 decimal places, the variance of X is 1.31.
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The complete question is as follows:
A small deck of four cards consists of one red card and three green cards. Draw 7 times with replacement. Assume each draw is a random selection of one card. Let X = the number of red cards drawn, compute the variance of X. Round to 2 decimal places.
Var(X) =
