1. A graduate student from the Catholic University of Puerto Rico carried out a research project on how the adult population in Puerto Rico communicates with the objective of estimating the percentage of adults who prefer postal mail to electronic mail. She started with a survey that she mailed to 600 of the adults she knew. She asked them to send her the answer to this question: Do you prefer to use email or the postal service? Upon receiving the responses, 250 adults indicated their preference for the postal service. After completing her study, the student concludes that 48% of adults in Puerto Rico prefer the postal service to email.
a. the variable
b.population
c.population
d.parameter
e. sample

When working with exponential and logarithmic equations, there are several ways to create an equation with exactly one real solution. One way is to use the properties of logarithms to create an equation that can be solved using paper and pencil. Here is an example:

Let's start with the equation y = 2ˣ. This is an exponential equation, and we want to find the value of x that makes the equation true. To do this, we can use the property of logarithms that states log_b(a) = n if and only if bⁿ = a. This means that we can rewrite the equation as log_2(y) = x.

Now, let's make the equation more interesting by adding a constant to both sides. We'll add 3 to the left side and 2 to the right side, giving us the equation log_2(y) + 3 = x + 2.

Finally, let's rearrange the equation so that we have a logarithmic equation with one real solution. We'll subtract 2 from both sides and then subtract x from both sides, giving us the equation log_2(y) - x + 1 = 0.

This equation has exactly one real solution, and it can be solved using paper and pencil. One way to solve it is to use the properties of logarithms to rewrite the equation in terms of y and then solve for y. Another way is to graph both sides of the equation and find the point where they intersect.

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Answer:

x would be 8 and y is 10

so (8,10)

Step-by-step explanation:

hope it helps

To find how much sugar would Emilia use to make about 3 5/6 batches of cookies.

1 1/8 cups of sugar

Next, we need to convert the mixed number to an improper fraction:

1 1/8 = (8 + 1) / 8 = 9/8

So, the amount of sugar needed for one batch of cookies is:

9/8 cups of sugar

To find the total amount of sugar needed for 3 5/6 batches, we can multiply the amount of sugar per batch by the number of batches:

(9/8 cups of sugar) x (23/6 batches) = 69/48 cups of sugar

thus, Emilia would need 69/48 cups of sugar to make 3 5/6 batches of cookies.

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Answer:

87.5% increase

Step-by-step explanation:

75 - 40 = 35

Find what percentage 35 is of 40, and you can do so by dividing.

35 ÷ 40 = 0.875

0.875 = 87.5%

the first answer is 40

the second answer is 15

if Max is at "start," he is 40ft away from the wall.

40 - 25 = 15ft

There are several different measures of central tendency that can be used to describe the average of a data set. The three most common measures of central tendency are the mean, median, and mode. Each of these measures can be used to describe different types of data. Here are three examples of different types of data and the measures of central tendency that can be used to best describe the average:

Continuous data - Mean
The mean is the most commonly used measure of central tendency and is best used for continuous data, such as heights or weights. To calculate the mean, you add up all of the data points and divide by the number of data points. For example, if you have the following data set: 2, 4, 6, 8, 10, the mean would be (2 + 4 + 6 + 8 + 10) / 5 = 6.

Ordinal data - Median
The median is the middle value in a data set and is best used for ordinal data, such as rankings or scores. To calculate the median, you first need to order the data set from smallest to largest. Then, if there are an odd number of data points, the median is the middle value. If there are an even number of data points, the median is the average of the two middle values. For example, if you have the following data set: 1, 2, 3, 4, 5, the median would be 3.

Nominal data - Mode
The mode is the most frequently occurring value in a data set and is best used for nominal data, such as categories or names. To calculate the mode, you simply count how many times each value appears in the data set and choose the one that appears most frequently. For example, if you have the following data set: A, A, B, B, B, C, C, the mode would be B.

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Answer:

Step-by-step explanation:

you get angle one from opposite angles = 85°

second angle :

98° x 2 = 196°

360° - 196° = 164°

164°/2 = 82°

Finding angle x:

82° + 85°  = 167°

180°-167° = 13°

x=13°

Answer: 2.1429

Step-by-step explanation:

The answer is 2.1429. This is because 7 divided by 1 is 7, and 7 divided by three thirds is the same as 7 divided by 1.5, which is equal to 4.6666. Therefore, 7 divided by 1 and three thirds is equal to 7 divided by 4.6666, which equals 2.1429.

The simple multiplier of the economy represented by the system of equation above is: 4/7.

The simple multiplier is the ratio of the change in equilibrium output to a change in autonomous expenditures, such as government spending or investment.

To find the simple multiplier in the economy, we need to first determine the equation for equilibrium output, which is where aggregate demand (AD) equals aggregate supply (AS).

Setting y in both equations equal to each other, we get:

710 - 30p + 5g = 10 + 5p - 2s

Simplifying and rearranging, we get:

35p = 700 + 2s - 5g

p = (20/7) + (2/35)s - (1/7)g

Now that we have the equilibrium price, we can substitute it back into the AD equation to find the equilibrium output (y):

y = 710 - 30[(20/7) + (2/35)s - (1/7)g] + 5g

y = (400/7) + (6/7)s + (4/7)g

The simple multiplier is then equal to the change in equilibrium output divided by the change in government purchases:

simple multiplier = Δy/Δg = 4/7

Therefore, the simple multiplier in the economy is 4/7.

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The population function is N(t) = 850(0.96)^t.

The base of the exponential function is (0.96), which is less than 1. This means that the function is decreasing over time.

Therefore, the correct answer is:

A. The population is decreasing by 4% per year.

Answer: 126

Step-by-step explanation: I belive that is the answer

The volume of the earth dug out from a pit = 23.4 m³

Let us assume that l represents the length of the pit, 'w' represents the width and 'h' be the height of the pit.

Here, the length of the pit(l) = 6.5 m

the width of the pit (w) = 2.4 m

height of the pit(h) = 1.5 m

We need to find the volume of earth dug out from a pit.

We know that pit is of the cuboid shape.

Using the formula of volume of cuboid,

V = l × w × h

V = 6.5 × 2.4 × 1.5

V = 23.4 m³

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The number of hours one would spend doing homework now would be; 2.88 hours.

As evident in the task content; One spends 8% doing homework, if one adds 4% more.

The total percent of time spent doing homework is; 12%.

Since there are 24 hours in a day; it follows that the number of hours spent doing one's homework is;

= 12% of 24 = 0.12 × 24.

= 2.88 hours.

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The vector form of the general solution of the given system of linear equations is given by:

{x} = {x1, x2, x4} = s { -1, 1, 0} + t { -2, 0, 1}

where s and t are arbitrary constants.

To find the vector form of the general solution, we need to find the null space of the coefficient matrix of the system of linear equations. The coefficient matrix of the system is:

A = [ 1 1 0 1; 1 2 0 4; 2 0 0 -4]

The null space of A is the set of all vectors x such that Ax = 0. We can find the null space of A by reducing A to its reduced row echelon form:

A = [ 1 0 0 -2; 0 1 0 1; 0 0 0 0]

From the reduced row echelon form of A, we can see that x1 and x2 are the leading variables and x4 is the free variable. Therefore, the general solution of the system of linear equations is given by:

x1 = -2x4
x2 = x4
x4 = x4

We can write the general solution in vector form as:

{x} = {x1, x2, x4} = x4 { -2, 1, 1}

Since x4 is an arbitrary constant, we can write the general solution in terms of two arbitrary constants s and t as:

{x} = {x1, x2, x4} = s { -1, 1, 0} + t { -2, 0, 1}

Therefore, the vector form of the general solution of the given system of linear equations is:

{x} = {x1, x2, x4} = s { -1, 1, 0} + t { -2, 0, 1}

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Answer:

Step-by-step explanation:

Use Pythagorean's Theorem to find the length of the hypotenuse

a² + b² = c²

20² + 15² = c²

400 + 225 = c²

625 = c²

25 = c

Cosine is adjacent over hypotenuse, so

20/25 = 4/5

The final expression after the subtraction is -6x + 4y + 12.

The given expression is:

(2x - 2y - 24 + 2y + 24) - (-4x - 2y + 12)

Simplifying the expression inside the parentheses, we get:

2x - 2y + 2y + 24 - 4x + 2y - 12

Combining like terms, we get:

(-2x + 2y + 2y) + (24 - 12) - 4x

Simplifying further, we get:

-2x + 4y + 12 - 4x

Combining like terms, we get:

-6x + 4y + 12

Therefore, the final expression after the subtraction is -6x + 4y + 12.

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The equation of the line that is parallel to the line y = 7x - 7 and passes through the point (-6,6) is y = 7x + 48. The equation of the line perpendicular to the resulting line is y = (-1/7)x + 36/7.

To find the equation of a line that is parallel to another line and passes through a given point, we can use the slope-intercept form of a line (y = mx + b), where m is the slope and b is the y-intercept.

Since parallel lines have the same slope, the slope of the new line will also be 7.

To find the y-intercept, we can plug in the given point (-6, 6) into the equation and solve for b:

6 = 7(-6) + b

b = 6 + 42

b = 48

So the equation of the parallel line is y = 7x + 48.

To find the equation of a line that is perpendicular to another line, we can use the fact that the slope of a perpendicular line is the negative reciprocal of the original slope. So the slope of the perpendicular line will be -1/7.

Again, we can plug in the given point (-6, 6) into the equation and solve for b:

6 = (-1/7)(-6) + b

b = 6 - 6/7

b = 36/7

So the equation of the perpendicular line is y = (-1/7)x + 36/7.

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1) The zero vector of the vector space R2 is ⟨0,0⟩.

2) The zero vector of the vector space of 2×2 matrices is [[0,0],[0,0]].

3) The zero vector for the vector space of all functions f:R→R is f(x) = 0.

What is vector space?

A vector space is a mathematical structure consisting of a set of vectors that can be added together and scaled (multiplied) by scalars, such as real numbers, satisfying certain axioms.

The zero vector of the vector space R2 is ⟨0, 0⟩. This is because the zero vector of a vector space is the unique vector which when added to any vector in the space results in that same vector. In R2, the vector ⟨0, 0⟩ has this property, because for any vector ⟨a, b⟩ in R2, ⟨0, 0⟩ + ⟨a, b⟩ = ⟨a, b⟩.

The zero vector of the vector space of 2×2 matrices is [[0,0],[0,0]]. This is because the zero vector of a vector space is the unique matrix which when added to any matrix in the space results in that same matrix. In the space of 2×2 matrices, the matrix [[0,0],[0,0]] has this property, because for any matrix [[a,b],[c,d]] in the space, [[0,0],[0,0]] + [[a,b],[c,d]] = [[a,b],[c,d]].

The zero vector for the vector space of all functions f:R→R is f(x) = 0. This is because the zero vector of a vector space is the unique function which when added to any function in the space results in that same function. In the space of all functions f:R→R, the function f(x) = 0 has this property, because for any function f(x), f(x) + 0 = f(x).

Hence,

1) The zero vector of the vector space R2 is ⟨0,0⟩.

2) The zero vector of the vector space of 2×2 matrices is [[0,0],[0,0]].

3) The zero vector for the vector space of all functions f:R→R is f(x) = 0.

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If h(x) = (-x + 1)2 – 5 and g(x) = -x – 2, then (hog)(x) will be B. -x2 + 2x + 2.

If h(x) = (-x + 1)2 – 5 and g(x) = -x – 2, then (hog)(x) = (h(g(x)). This means that we need to plug in the value of g(x) into the equation for h(x) and simplify. To get this result, first use the chain rule:

(hog)(x) = h(g(x)).

So, (hog)(x) = h(g(x)) = h(-x-2) = (-(x)-2+1)2 – 5 = (-x-1)2 – 5

Expanding the square, we get:

(hog)(x) = (-x-1)(-x-1) – 5 = x2 + 2x + 1 – 5 = x2 + 2x - 4

Therefore, the correct answer is B. -x2 + 2x + 2.

Answer: B. -x2 + 2x + 2

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a. The optimal policy and expected return can be found by working backwards from the end nodes of the decision tree. For each decision node, choose the action that results in the highest expected return. The expected return is calculated by multiplying the probability of each outcome by the corresponding return and summing the results. The optimal policy is to choose A if X is high, and B if X is low.

The expected return is 0.7*30 + 0.3*10 = 24.

b. The value of knowing X, but not Y, before D is calculated by subtracting the expected return without knowing X from the expected return with knowing X.

The expected return without knowing X is 0.5*24 + 0.5*24 = 24.

The expected return with knowing X is 0.7*30 + 0.3*10 = 24.

Therefore, the value of knowing X is 24 - 24 = 0.

c. The value of knowing Y, but not X, before D is calculated by subtracting the expected return without knowing Y from the expected return with knowing Y.

The expected return without knowing Y is 0.5*24 + 0.5*24 = 24.

The expected return with knowing Y is 0.8*30 + 0.2*10 = 26.

Therefore, the value of knowing Y is 26 - 24 = 2.

d. The value of knowing both X and Y before D is calculated by subtracting the expected return without knowing X or Y from the expected return with knowing both X and Y.

The expected return without knowing X or Y is 0.5*24 + 0.5*24 = 24.

The expected return with knowing both X and Y is 0.7*0.8*30 + 0.7*0.2*10 + 0.3*0.8*10 + 0.3*0.2*30 = 25.2.

Therefore, the value of knowing both X and Y is 25.2 - 24 = 1.2.

e. The influence diagram that corresponds to this decision tree is shown below:

X -> D -> Y -> R
   -> A -> R
   -> B -> R

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As a result, approximately 22,500 spectators at the Super Bowl will likely not be donning club jerseys. The correct response is (C) 22,500 people.

A mathematical concept known as proportionality describes the relationship between two quantities that change in a way that keeps their ratio constant. This means that if the size of one quantity increases or decreases by a certain amount, the size of the other quantity will do the same, maintaining their relative size. In other words, we can state that A is directly proportional to B if we have two quantities, A and B, and their ratio is constant. Frequently, this is expressed as: A ∝ B or A = k * B where k is a ratio constant.

given

The number of spectators who won't be sporting team jerseys at the Super Bowl can be estimated using proportions:

If 150 out of the first 500 individuals to enter through the main gate were not donning team uniforms, then the percentage of those without team uniforms is:

150/500 = 0.3

This indicates that 30% of those who entered through the main gate did not have team jerseys on.

We can determine the approximate number of spectators who won't be donning team jerseys as follows, assuming that this proportion is representative of the entire 75,000 people in attendance:

0.3 * 75,000 = 22,500

As a result, approximately 22,500 spectators at the Super Bowl will likely not be donning club jerseys. The correct response is (C) 22,500 people.

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The solution of the inequaltiy is v <= 6 or v >= 2.

To solve the compound inequality 4v+3<=27 or 2v-4>=0, we need to solve each inequality separately and then combine the solutions.

For the first inequality, 4v+3<=27, we can isolate the variable on one side of the inequality by subtracting 3 from both sides:

4v <= 24

Next, we can divide both sides by 4 to get:

v <= 6

For the second inequality, 2v-4>=0, we can isolate the variable on one side of the inequality by adding 4 to both sides:

2v >= 4

Next, we can divide both sides by 2 to get:

v >= 2

Now, we can combine the solutions to get the final solution for the compound inequality:

v <= 6 or v >= 2

This means that the solution set includes all values of v that are less than or equal to 6 or greater than or equal to 2.

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Answer: $14.58

Step-by-step explanation:

13.50 x .08 = 1.08

13.50 + 1.08 = 14.58

The mean selling price of new homes was $114,000. The population standard deviation was $5,000. A random sample of 100 new home sales was taken without doing the calculations, ranges the sample mean selling price is most likely to lie between C) $113,000 - $115,000.

The sample mean selling price is most likely to lie in the range of $113,000 to $115,000 because this range is within one standard deviation (i.e., $5,000) of the population mean of $114,000, and therefore it contains approximately 68% of the sample mean values. The other ranges are outside one standard deviation from the mean, and therefore, the probability of the sample mean being in those ranges is lower. However, it is important to note that the actual sample mean could fall outside this range as it is still subject to random variation.

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Answer:

To find the interest rate when given the principal, time, and simple interest, we can use the formula:

Simple Interest = (Principal * Rate * Time) / 100

where:

Simple Interest is the given value of 4252.50

Principal is 18000

Time is 54 months

Rate is the unknown we want to solve for

Substituting the given values, we get:

4252.50 = (18000 * Rate * 54) / 100

Multiplying both sides by 100 and dividing by 18000 * 54, we get:

Rate = (4252.50 * 100) / (18000 * 54)

Rate = 4.398%

Therefore, the interest rate is 4.398% (rounded to three decimal places).

Step-by-step explanation:

Sure! Here is a step-by-step explanation of how to find the interest rate:

Given:

Principal = 18000

Time = 54 months

Simple Interest = 4252.50

Formula:

Simple Interest = (Principal * Rate * Time) / 100

We want to solve for Rate.

Substitute the given values into the formula:

4252.50 = (18000 * Rate * 54) / 100

Simplify by multiplying both sides by 100:

425250 = 18000 * Rate * 54

Divide both sides by 18000 * 54:

Rate = 425250 / (18000 * 54)

Simplify the expression on the right-hand side:

Rate = 0.04398

Convert the decimal to a percentage:

Rate = 4.398%

Therefore, the interest rate is 4.398%.

Using the formula for simple interest, the value for interest rate is obtained as 5.25%.

What is Simple Interest?

Simple interest is a way to figure out how much interest will be charged on a sum of money at a specific rate and for a specific duration of time. Contrary to compound interest, where we add the interest of one year's principal to the next year's principal to compute interest, the principal amount under simple interest remains constant.

We can use the formula for simple interest -

I = P × r × t

where I is the interest, P is the principal, r is the interest rate, and t is the time in years.

In this case, the principal is $18,000, the time is 54 months which is 4.5 years, and the simple interest is $4,252.50.

Substituting these values in the formula, we get:

4252.50 = 18000 × r × 4.5

Solving for r, we get -

r = 4252.50 / (18000 × 4.5)

= 0.0525 or 5.25%

Therefore, the interest rate is 5.25%.

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The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. We are given that the line passes through the point (0,9) and has a slope of -3, so we can substitute these values into the equation to find the y-intercept:

y = mx + b

9 = (-3)(0) + b

b = 9

Now we know that the y-intercept is 9, so we can write the equation of the line:

y = -3x + 9

Therefore, the equation of the graph that passes through (0,9) and has a slope of -3 is y = -3x + 9.

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Answer:

11 meters, 4.1 centimeters

Step-by-step explanation:

If for every centimeter it equals 2 meters, we can use this expression to solve for the width of the building in real-life:

Therefore, the width of the building is 11 meters in real life.

If the real-life height of the building is 8.2 m tall, then we can use this expression:

Because we were given the drawings width the first time, we needed to multiply by 2 to get the real-life height in meters. But now that we are given the real-life height, we now need to divide by 2 to get the height of the drawing in centimeters.

Therefore, the width, in meters, of the building in real life is 11 meters, and the height of the drawing is 4.1 centimeters.

The amount of element left after the decay is found as 43 grams.

Decay rate is given as:

N = N₀(1 - r)ˣ

x - is the time in minutes

N₀ - initial mass (570 grams)

r - rate of decay (18%)

Put the values:

N = 570(1 - 0.18)¹³

N = 570*0.0757

N = 43

Thus, the amount of element left after the decay is found as 43 grams.

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The opposite sides of the quadrilateral should be parallel and the diagonals should be equal. [For a rectangle]

First, let's find the slope of AB and its perpendicular slope.

Slope of AB = (y2 - y1)/(x2 - x1) = (12 - (-3))/(1 - (-2)) = 5

Perpendicular slope of AB = -1/5

The midpoint of AB is ((-2+1)/2, (-3+12)/2) = (-0.5, 4.5)

Let D be the point on line segment AC such that AD is perpendicular to AC. Since AB is parallel to DC, the slope of DC is also 5.

Slope of AC = (-4 - (-3))/(3 - (-2)) = -1/5

The equation of line AC is y = (-1/5)x - (13/5)

The equation of line DC passing through (3,-4) with slope 5 is y - (-4) = 5(x - 3)

Solving these two equations, we get D(2,-14/5).

Therefore, the coordinates of point D are (2, -14/5).

We can plot the points on the coordinate axes and verify that A, B, C, and D indeed form a rectangle.