simplify -8-(12)+(-2)​

The area of the patio is given as follows:

82 m².

The patio is formed by a composite shape, hence we must obtain the area of each part of the shape and add them.

The shape is composed as follows:

The area of the rectangle is given as follows:

3 x 6 = 18 m².

The area of the trapezoid is given as follows:

A = 0.5 x 8 x (10 + 6)

A = 64 m².

Hence the total area of the shape is given as follows:

18 + 64 = 82 m².

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=190

Step-by-step explanation:

[tex]9.5 \div 0.05[/tex]

= 190

Based on an exponential growth rate of 4% each year, the town whose population is 20,000 will be 25,306 after 6 years.

An exponential growth refers to a constant ratio of increase per period.

An exponential growth is modeled by the exponential growth function, which is one of the two exponential functions, including exponential decay function.

The current or initial population of the town = 20,000

The annual growth rate = 4% = 0.04

Growth factor = 1.04 (1 + 0.04)

The number of years from the initial year of census = 6 years

Let the number of years from the initial year = n

Let the population after n years = y

y = 20,000(1.04)^6

y = 25,306

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The Taylor series of the function f(x) = f(0) + f'(0)x + (f''(0)x^2)/2! + (f'''(0)x^3)/3! + ... for f'(x) = 3f(x) and f(0) = 2 is:

f(x) = 2 + 6x + 9x^2 + (9/2)x^3 + (27/8)x^4 + ...

To find the Taylor series of f(x), we need to first find the derivatives of f(x) and evaluate them at x=0. Given that f'(x) = 3f(x) and f(0) = 2, we can start by finding the first few derivatives of f(x) and evaluating them at x=0:

f'(x) = 3f(x)

f''(x) = 3f'(x) = 9f(x)

f'''(x) = 9f'(x) = 27f(x)

f''''(x) = 27f'(x) = 81f(x)

Evaluating these derivatives at x=0, we get:

f(0) = 2

f'(0) = 3f(0) = 6

f''(0) = 9f(0) = 18

f'''(0) = 27f(0) = 54

f''''(0) = 81f(0) = 162

Now we can use these values to write out the Taylor series of f(x):

f(x) = f(0) + f'(0)x + (f''(0)x^2)/2! + (f'''(0)x^3)/3! + (f''''(0)x^4)/4! + ...

= 2 + 6x + (18x^2)/2! + (54x^3)/3! + (162x^4)/4! + ...

= 2 + 6x + 9x^2 + (9/2)x^3 + (27/8)x^4 + ...

Therefore, the Taylor series of f(x) is given by:

f(x) = 2 + 6x + 9x^2 + (9/2)x^3 + (27/8)x^4 + ...

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The solution is: the area of the regular hexagon is 41.57 in^2.

Here, we have,

given that,

the figure is a regular hexagon.

so, we have,

n = 6

and, given that, r = 4in

so, we get,

central angle = 360/n = 360/6 = 60

so, we have

Area = n * 1/2 * r^2 * sin 60

        = 6 *1/2* 16 * √3/2

        = 41.57 in^2.

Hence, The solution is: the area of the regular hexagon is 41.57 in^2.

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The angles whose equals to 60 ° are ∠1 , ∠2 , ∠3 , ∠4 . This is due to opposite angles and angle pairs due to a transversal with a parallel.

Note that

l and m are the parallel lines .

m ∠ 1 = 60 °

Thus

∠1 = ∠2 = 60 °

(As l and m are the parallel lines and ∠ 1 and ∠2 are the vertically opposite angles .)

As

∠2 = ∠3

(As l and m are the parallel lines and ∠2 and ∠3 are the alternate interior angles. )

As

∠3 = ∠4 = 60°

( As l and m are the parallel lines and ∠ 3 and ∠4 are the vertically opposite angles )

Therefore the angles whose equals to 60 ° are ∠1 , ∠2 , ∠3 , ∠4 .

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a. To calculate the percentage increase in salary if ros (return on the firm's stock) increases by 50 points, we can use the coefficient of ros from the regression equation:

Coefficient of ros = 0.00024

Percentage increase in salary = Coefficient of ros * Change in ros * 100

Change in ros = 50

Percentage increase in salary = 0.00024 * 50 * 100 = 1.2%

The percentage increase in salary is predicted to be 1.2% if ros increases by 50 points. Whether this is considered a practically large effect on salary depends on the context and the magnitude of other factors influencing CEO salaries.

b. To test the null hypothesis that ros has no effect on salary against the alternative that ros has a positive effect, we can perform a hypothesis test using the t-statistic for the coefficient of ros.

The t-statistic for ros = Coefficient of ros / Standard error of ros

Standard error of ros = 0.00054

t-statistic = 0.00024 / 0.00054 = 0.4444

At the 10% significance level, with 209 observations, the critical t-value is approximately ±1.652.

Since the absolute value of the t-statistic (0.4444) is less than the critical t-value (1.652), we fail to reject the null hypothesis. This means that we do not have enough evidence to conclude that ros has a positive effect on CEO salary at the 10% significance level.

c. Whether to include ros in a final model explaining CEO compensation in terms of firm performance depends on various factors such as statistical significance, practical significance, and the overall objective of the analysis. In this case, the coefficient of ros is statistically insignificant at the 10% significance level, and the effect size is relatively small (0.00024). Therefore, it may be reasonable to exclude ros from the final model if the focus is on variables that have a more substantial impact on CEO compensation, such as sales and roe.

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a. The tax on the bowl of soup was $3.37.

b. The total price of the bowl of soup, including tax, was $7.87.

c. Quan should get back $12.13 from his $20 bill.

a. To calculate the tax on the bowl of soup, we multiply the cost of the soup ($4.50) by the tax rate (0.075). Therefore, the tax on the soup is $4.50 * 0.075 = $0.337, which can be rounded to $3.37.

b. To find the total price of the bowl of soup, including tax, we add the cost of the soup and the tax amount. The cost of the soup is $4.50, and the tax is $3.37. Adding these together gives us $4.50 + $3.37 = $7.87.

c. Quan paid with a $20 bill, and the total price of the soup, including tax, was $7.87. To determine how much money Quan should get back, we subtract the total price from the amount paid. Subtracting $7.87 from $20 gives us $20 - $7.87 = $12.13. Therefore, Quan should receive $12.13 back from his payment.

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If a is an invertible n×n matrix and b is an n×p matrix, then the equation ax=b has a unique solution given by [tex]x=a^{-1}b.[/tex]

A⁻¹B is the unique solution to the matrix equation AX = B, given that A is an invertible n x n matrix and B is an n x p matrix.

Based on the given terms, it seems like we want to know why A⁻¹B is a unique solution to the matrix equation AX = B, where A is an invertible n x n matrix and B is an n x p matrix.
A is an invertible n x n matrix, which means it has a unique inverse, A⁻¹.

This is because A is a square matrix and its determinant is non-zero.
B is an n x p matrix.

To find the solution for the matrix equation AX = B, we need to find a matrix X that satisfies this equation.
To solve for X, multiply both sides of the equation by the inverse of A, A⁻¹:
A⁻¹(AX) = A⁻¹B
Since A⁻¹A = I (the identity matrix), the equation becomes:
IX = A⁻¹B
Since the identity matrix times any matrix is the same matrix, X = A⁻¹B.
The uniqueness of the solution comes from the fact that A has a unique inverse, A⁻¹.

If there were multiple inverses, there could be multiple solutions, but since A⁻¹ is unique, so is the solution X.

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Answer:

Surface area = 50.27 square feet

Step-by-step explanation:

The formula for surface area (SA) of a sphere is

SA = 4πr^2, where r is the radius.

Although we're not told the radius, we know that C stands for the circumference and the formula for circumference is

C = πd

We know that the radius is half the diameter and since the circumference of the circle is 4π, the radius must be 2 as 4 /2 = 2

Since we now know that the radius of the circle is 2 feet, we can find the volume by plugging it into the formula

SA = 4π * (2)^2

SA = 4π * 4

SA = 16π

SA = 50.26548246

SA = 50.27 square feet

The function f(x) = 5x/(x^2 + 6x + 8) has vertical asymptotes at x = -2 and x = -4.

A. To find the horizontal asymptote(s) for the function, we need to take the limit as x approaches infinity and negative infinity.

Therefore, the horizontal asymptote is y = 0.

B. To find the vertical asymptote(s) for the function, we need to determine the values of x that make the denominator of the function equal to zero.

x² + 6x + 8 = 0

We can factor this quadratic equation as:

(x + 2)(x + 4) = 0

Therefore, the vertical asymptotes are x = -2 and x = -4.

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So, the inequality which represents the situation is 7.5h + 30 ≥ 300, where h ≥ 36. Hence, the answer is B.

Given: Chris works at a bookstore and earns $7. 50 per hour plus a $2 bonus for each book she sells. Chris sold 15 books. The total earning of Chris,E(h) = 7.5h + 2 × 15 = 7.5h + 30 dollars where h is the number of hours worked by Chris .In order to find out the minimum hours she has to work to earn at least $300, we have to solve the inequality:7.5h + 30 ≥ 300 ⇒ 7.5h ≥ 270 ⇒ h ≥ 36.

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The total area of the figure in this problem is given as follows:

41.3 ft².

The area of the composite figure is given by the sum of the areas of all the parts that compose the figure.

The figure in this problem is composed as follows:

Then the area of the triangle is given as follows:

At = 0.5 x 6 x 3 = 9 ft².

The area of the semicircle is given as follows:

Ac = π x 3² = 28.3 ft².

The area of the square is given as follows:

As = 2² = 4 ft².

Then the total area of the figure is given as follows:

9 + 28.3 + 4 = 41.3 ft².

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To find the expected value of a discrete probability distribution, we multiply each possible outcome by its probability and then sum the products. In this case, we have:

E(X) = 0(3/16) + 1(3/16) + 2(1/8) + 3(1/2)

    = 0 + 3/16 + 1/4 + 3/2

    = 1.5

Therefore, the expected value of this distribution is 1.5.

In probability theory, the expected value (also known as the mean or average) of a discrete probability distribution is a measure of the central tendency of the distribution. It represents the theoretical long-term average of the values taken by a random variable over an infinite number of trials.

To find the expected value of a discrete probability distribution, we multiply each possible value of the random variable by its corresponding probability and add up the products. In other words, if X is a discrete random variable with possible values x1, x2, ..., xn and corresponding probabilities p1, p2, ..., pn, then the expected value E(X) is:

E(X) = x1 * p1 + x2 * p2 + ... + xn * pn

For example, consider the discrete probability distribution given in the table:

x     |  0  |  1  |  2  |  3  

pr(x) | 3/16| 3/16| 1/8 | 1/2

To find the expected value of this distribution, we multiply each possible value of X by its corresponding probability and add up the products:

E(X) = 0*(3/16) + 1*(3/16) + 2*(1/8) + 3*(1/2) = 0 + 0.1875 + 0.25 + 1.5 = 1.9375

Therefore, the expected value of this distribution is 1.9375.

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The first step in answering this question is to calculate the proportion of customers who prefer fresh vegetables for each sample. The formula for proportion is' p= x/n where p is the proportion, x is the number of customers who prefer fresh vegetables, and n is the sample size. Using this formula, we can calculate the proportion for each sample as follows: For sample

A: p = 11/20 = 0.55For sample B: p = 14/20 = 0.70For sample C :p = 12/20 = 0.60Next, we can use these proportions to estimate the number of regular customers of the store who prefer fresh vegetables.

To do this, we multiply each proportion by the total number of regular customers (600) as follows: For sample

A: Estimated number of customers who prefer fresh vegetables = 0.55 × 600 = 330For sample B: Estimated number of customers who prefer fresh vegetables = 0.70 × 600 = 420For sample C: Estimated number of customers who prefer fresh vegetables = 0.60 × 600 = 360Now we need to describe the variation of the estimates.

the standard deviation of the estimates as follows:SD = sqrt [(330 - 370)² + (420 - 370)² + (360 - 370)² / 3]≈ 47.2Therefore, the estimates for the number of regular customers who prefer fresh vegetables have a standard deviation of approximately 47.2 customers. This means that we can expect the estimates to vary by about 47.2 customers on average due to sampling error.

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A horizontal asymptote is a straight line that a function approaches as x approaches infinity or negative infinity.

For the function f(x) = (x-2)/(x^2 + 1):

Horizontal asymptotes:

As x approaches infinity or negative infinity, the highest degree term in the numerator and denominator are the same, which is x^2. Therefore, we can use the ratio of the coefficients of the highest degree terms to determine the horizontal asymptote. In this case, the coefficient of x^2 in both the numerator and denominator is 1. So the horizontal asymptote is y = 0.

Vertical asymptotes:

Vertical asymptotes occur when the denominator of a rational function equals zero and the numerator does not. So, to find the vertical asymptotes of f(x), we need to solve the equation x^2 + 1 = 0. However, this equation has no real solutions, which means that there are no vertical asymptotes for f(x).

For the function f(x) = (x-2)/(x^2 - 11):

Vertical asymptotes:

To find the vertical asymptotes, we need to solve the equation x^2 - 11 = 0. This equation has two real solutions, which are x = sqrt(11) and x = -sqrt(11). These are the vertical asymptotes of f(x).

Horizontal asymptotes:

As x approaches infinity or negative infinity, the highest degree term in the numerator and denominator are x and x^2 respectively. Therefore, the horizontal asymptote is y = 0. However, we also need to check if there are any oblique asymptotes. To do this, we can use long division or synthetic division to divide the numerator by the denominator. After doing this, we get:

    x - 2

--------------

x^2 - 11 | x - 2

          x - sqrt(11)

        ------------

              sqrt(11) + 11

           sqrt(11) + 2

         --------------

               -9

Since the remainder is a non-zero constant (-9), there are no oblique asymptotes. So the only asymptotes for f(x) are the vertical asymptotes x = sqrt(11) and x = -sqrt(11).

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Farzana makes 38.3 pounds of egg salad each week for her sandwich shop.

Farzana makes 5 pounds of egg salad each day from Monday to Saturday, totaling 6 days. On Sunday, she makes 8.3 pounds of egg salad. To calculate the total amount of egg salad Farzana makes in a week, we need to add up the amounts from each day.

From Monday to Saturday, she makes a total of 5 pounds * 6 days = 30 pounds of egg salad.

On Sunday, she makes 8.3 pounds of egg salad.

To find the total amount for the week, we add the amounts from Monday to Saturday to the amount from Sunday:

30 pounds + 8.3 pounds = 38.3 pounds

Therefore, Farzana makes 38.3 pounds of egg salad each week for her sandwich shop.

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The function f(x)=x has a domain and target of the set of Real numbers. To describe this function, we need to consider its one-to-one and onto properties. A function is one-to-one if each element of the domain is mapped to a unique element of the target, and a function is onto if every element of the target is mapped to by at least one element of the domain. In this case, the function f(x)=x is one-to-one and onto, making it a bijection. Therefore, the most appropriate way to describe this function is option b: f is a bijection.

To determine the appropriate way to describe the function f(x)=x, we need to consider its one-to-one and onto properties. A function is one-to-one if each element of the domain is mapped to a unique element of the target, and a function is onto if every element of the target is mapped to by at least one element of the domain. In this case, for every x in the domain of Real numbers, there is a unique value of x in the target of Real numbers. This means that the function is one-to-one. Additionally, every element in the target is mapped to by at least one element in the domain. Therefore, the function is also onto. Since the function is both one-to-one and onto, it is a bijection.

The function f(x)=x has a domain and target of the set of Real numbers and is a bijection. This means that for every x in the domain, there is a unique value of x in the target, and every element in the target is mapped to by at least one element in the domain. Therefore, the most appropriate way to describe this function is option b: f is a bijection.

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Given:

ZLMN and LPML are linear pairs,m_LMN = 7x -3, mZPML = 13x + 3.

Let's solve the problem one by one.Part A:m_LMN + mZPML = 180 [linear pair]7x - 3 + 13x + 3 = 18020x = 180x = 9m_LMN = 7(9) -3 = 60m_ZPML = 13(9) + 3 = 120m_LMN = 60, mZPML = 120We need to find the mzLMN.

By definition,

linear pairs are adjacent angles whose non-common sides are opposite rays. So, their angles add up to 180 degrees.So,m_LMN + mZLMN = 18060 + mZLMN = 180mZLMN = 120Therefore, mzLMN = 120/2 = 60 degreesPart B:ZPMR and ZLMN form a vertical pair

By definition,

vertical angles are congruent, so mZPMR = m_LMN = 60 degreesmZPMR = 5y + 4Putting the value of mZPMR we get,5y + 4 = 605y = 56y = 11.2, the value of y is 11.2. Answer: Part A: mzLMN = 60 degreesPart B: m_PML = 60 degrees; value of y is 11.2.

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ZLMN and LPML are linear pairs the value of y is (13x - 7)/5.

Given, ZLMN and LPML are linear pairs and mLNM = 7x -3 and

mPML = 13x + 3.

Part A: To find mzLMNSince, ZLMN and LPML are linear pair,

Therefore, mLMN + mPML = 180

Substitute the given values in the above equation

7x - 3 + 13x + 3 = 18020

x = 180

x = 9

Substitute the value of x in mLNM7(9) - 3

mLNM = 63 - 3

mLNM = 60

Thus, the value of mLNM is 60.

Part B: If ZPMR and ZLMN form a vertical pair, then they are equal.

Therefore, mZLMN = mZPMR

Now, mZPMR = 5y + 4

Given, mZPMR = mLMN

13x + 3 = 7x - 3 + 5y + 4

13x + 3 = 5y + 4 + 7x - 3

Move the constant term to the right

5y = 13x + 3 - 4 - 35

y = 13x - 4y = (13x - 7)/5

Thus, the value of y is (13x - 7)/5.

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The function g(x) = (cos(x))/2 + sin(x) has a local minimum at x = π/6 and a local maximum at x = 7π/6 over the interval [0,2π].

1) Find the critical points of g(x) over the interval [0,2π]:

g'(x) = (-sin(x))/2 + cos(x)

Setting g'(x) = 0, we get:

(-sin(x))/2 + cos(x) = 0

cos(x) = (1/2)sin(x)

Using the identity sin^2(x) + cos^2(x) = 1, we can rewrite this as:

sin(x) = ±√3/2 cos(x)

Solving for x, we get:

x = π/6, 5π/6, 7π/6, 11π/6

2) Classify the critical points as local maxima, local minima or saddle points by using the first or second derivative test:

g''(x) = (-cos(x))/2 - sin(x)

At x = π/6, g'(π/6) = 1/2 and g''(π/6) = -√3/2 < 0, which means that x = π/6 is a local minimum.

At x = 5π/6, g'(5π/6) = -1/2 and g''(5π/6) = -√3/2 < 0, which means that x = 5π/6 is a local minimum.

At x = 7π/6, g'(7π/6) = -1/2 and g''(7π/6) = √3/2 > 0, which means that x = 7π/6 is a local maximum.

At x = 11π/6, g'(11π/6) = 1/2 and g''(11π/6) = √3/2 > 0, which means that x = 11π/6 is a local maximum.

3) Check the endpoints of the interval [0,2π] to see if they are local maxima or minima:

g(0) = 0.5, g(2π) = -0.5

Neither g(0) nor g(2π) are critical points, so they cannot be local maxima or minima.

Therefore, the function g(x) = (cos(x))/2 + sin(x) has a local minimum at x = π/6 and a local maximum at x = 7π/6 over the interval [0,2π].

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If the area of the rectangle is 15, the dimensions of the rectangle are l = √(15) and w = √(15).

The question is referring to a rectangle, we can use the formula for the area of a rectangle, which is A = lw, where A is the area, l is the length, and w is the width.

We are given that the area of the rectangle is 15, so we can set up an equation:

l * w = 15

We are not given any information about the length, so we cannot solve for l and w separately. However, if we assume that the rectangle is a square (i.e., l = w), then we can solve for the dimensions:

l * l = 15

l² = 15

l = √(15)

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Answer:

P (Score is not a factor of 6) = 1−31=32

This is my answer

The correct answer to this question is C: Using the same dates makes the second sample dependent on the first and reduces variability in water clarity attributable to date.

Taking measurements on the same dates during the year is important because it helps to control for the effect of seasonal changes in the water clarity of the lake.

For example, if the measurements were taken in the winter when the lake is frozen, the water clarity would likely be very different than in the summer when the lake is not frozen.

Since the absolute value of the test statistic (-0.24) is less than the critical value (2.571), we fail to reject the null hypothesis. Therefore, we do not have sufficient evidence to suggest that the clarity of the lake is improving at the alpha equals 0.05 level of significance.

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In every n-player tournament described in Exercise 12 of Section 2.4, there is at least one top player.

We will use the Well-Ordering Principle (WOP) to prove that in every n-player tournament, there is at least one top player.

Consider a tournament with n players.

Let's assume that there is no top player in the tournament.

This means that for every player x, there exists a player y who beats x and is beaten by another player z.

We can create a sequence of players: y1, z1, y2, z2, y3, z3, ..., yn, zn, where yi beats xi and is beaten by zi for every i from 1 to n.

Since there are only n players in the tournament, the sequence must repeat at some point due to the Pigeonhole Principle.

Let's say the sequence repeats with players ym and zm, where m < n.

Now, we have a subsequence: ym, zm, ym+1, zm+1, ..., yn, zn, y1, z1, y2, z2, ..., ym-1, zm-1, which is a cycle.

If we consider the players in the cycle from ym to zm-1, none of them can be a top player because they are all beaten by other players within the cycle.

However, we know that ym beats xm and zm-1 beats xm, so by the transitive property, ym must beat zm-1.

This means that ym is a top player, which contradicts our initial assumption.

Therefore, our assumption that there is no top player in the tournament is false.

By the WOP, there must be at least one top player in every n-player tournament.

This proof shows that in every n-player tournament described in Exercise 12 of Section 2.4, there is always at least one top player, as required.

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The hydrostatic force on the window is approximately 47,481 Newtons.

We can use the formula for hydrostatic force, which is:

F = ρghA

where F is the hydrostatic force, ρ is the density of the fluid (water in this case), g is the acceleration due to gravity, h is the depth of the window, and A is the area of the window.

First, we need to find the area of the window. Since the window is a semi-circle with diameter 70 centimeters, the radius is 35 centimeters, and the area is:

A = (π/2)r^2

= (π/2)(35 cm)^2

= 1225π/2 cm^2

Next, we need to convert the depth of the window to meters:

h = 2.5 m

We also need the density of water, which is approximately:

ρ = 1000 kg/m^3

Finally, we need the acceleration due to gravity, which we can assume is:

g = 9.8 m/s^2

Now we can plug these values into the formula:

F = ρghA

= (1000 kg/m^3)(9.8 m/s^2)(2.5 m)(1225π/2 cm^2)

≈ 47,481 N

Therefore, the hydrostatic force on the window is approximately 47,481 Newtons.

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Answer: m = 6

Step-by-step explanation: In a calculator, I put in the following equation:

12.6 = 0.85m + 7.5

and that have me the answer of 6

We can double check this solution by putting the following equation in the calculator:

(0.85 x 6) + 7.5 =

and you will see that is = to 12.6

Answer:

m = 6

Step-by-step explanation:

Isolate the variable, m. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS is the order of operations, and stands for:

Parenthesis

Exponents (& Roots)

Multiplications

Divisions

Additions

Subtractions

~

First, subtract 7.5 from both sides of the equation:

[tex]0.85m + 7.5 = 12.6\\0.85m + 7.5 (-7.5) = 12.6 (-7.5)\\0.85m = 12.6 - 7.5\\0.85m = 5.1[/tex]

Next, isolate the variable, m, by dividing 0.85 from both sides of the equation:

[tex]0.85m = 5.1\\\frac{(0.85m)}{0.85} = \frac{(5.1)}{0.85} \\m = \frac{5.1}{0.85} \\m = 6[/tex]

6 would be your value for m.

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This proves that the expected value of a Poisson distribution with parameter r is equal to r.

To prove that E(X) = r for X ~ Poisson(r), we use the definition of expected value:

E(X) = ∑x P(X = x) x

where the sum is taken over all possible values of X, and P(X = x) is the probability that X takes on the value x.

For the Poisson distribution, the probability mass function is:

P(X = x) = (e^-r * r^x) / x!

where r is the parameter of the Poisson distribution, representing the expected number of events per unit time (or space or other interval), and x is a non-negative integer.

Substituting this expression into the definition of expected value, we get:

E(X) = ∑x P(X = x) x

= ∑x (e^-r * r^x) / x! * x

= ∑x (e^-r * r^x) / (x-1)! (using x! = x(x-1)!)

= e^-r ∑x (r^x / (x-1)!)

= e^-r r ∑(x-1) [(r^(x-1)) / ((x-1)!)] (using the substitution k = x-1)

= e^-r r ∑k [(r^k) / k!]

= e^-r r e^r (using the power series expansion of e^r)

Therefore, we have:

E(X) = r

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The angle θ by taking the inverse cosine of the dot product divided by the product of the magnitudes: θ = acos((u · v) / (|u| |v|)).

The angle θ between the vectors u and v can be found by taking the inverse cosine of the dot product divided by the product of their magnitudes.

To find the angle θ between the vectors u and v, we need to calculate the dot product of the two vectors and divide it by the product of their magnitudes. The dot product of two vectors u and v is given by the formula u · v = |u| |v| cos(θ), where |u| and |v| are the magnitudes of u and v, respectively, and θ is the angle between them.

In this case, u = cos(π/3) i + sin(π/3) j and v = cos(3π/4) i + sin(3π/4) j. We can calculate the magnitudes of u and v as |u| = √(cos²(π/3) + sin²(π/3)) and |v| = √(cos²(3π/4) + sin²(3π/4)).

Next, we calculate the dot product of u and v as u · v = cos(π/3) * cos(3π/4) + sin(π/3) * sin(3π/4).

Finally, we find the angle θ by taking the inverse cosine of the dot product divided by the product of the magnitudes: θ = acos((u · v) / (|u| |v|)).

By evaluating this expression, we can determine the angle θ between the vectors u and v.

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The rate at which the percentage spent on food is changing on September 1 is approximately -0.34 percentage points per month.

We can start by taking the derivative of y with respect to x: y' = -0.25*35x^(-1.25) = -8.75x^(-1.25). Then, we can substitute x with the given function of t: x = 7 + 0.2t. Thus, y = 35(7 + 0.2t)^(-0.25). To find the rate of change of y with respect to t, we can use the chain rule:

(dy/dt) = (dy/dx)(dx/dt) = -8.75(7 + 0.2t)^(-1.25)(0.2)

We want to find the rate of change on September 1, which is 8 months after January 1. So we can substitute t = 8 into the equation above:

(dy/dt) = -8.75(7 + 0.28)^(-1.25)(0.2) ≈ -0.34

Therefore, the rate at which the percentage spent on food is changing on September 1 is approximately -0.34 percentage points per month.

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