Help PLEASEEEE!!!!!!!!!

Answer: D

Step-by-step explanation:

Answer:

49.60

Step-by-step explanation:

she saves 12.40

Since the 95% confidence interval includes zero, we cannot conclude that the population means are different without conducting the test in part a.

a. Significance test:

Null hypothesis (H0): The population means are equal for females and males (μ1 = μ2).

Alternative hypothesis (H1): The population means are not equal for females and males (μ1 ≠ μ2).

Significance level (α): 0.05

We will use a two-sample t-test for independent samples to compare the means:

Calculate the pooled variance (Sp^2):

Sp^2 ≈ 5.27

Calculate the standard error (SE):

SE ≈ 0.11

Calculate the t-statistic:

t ≈ 1.18

Calculate the degrees of freedom (df):

df = N1 + N2 - 2

df = 1117 + 870 - 2

df = 1985

Comparing the t-statistic and the critical t-value for a two-tailed test with α = 0.05:

t_critical ≈ ±1.96 (from t-distribution table)

Since -1.96 < 1.18 < 1.96, we fail to reject the null hypothesis.

Conclusion: There is insufficient evidence to conclude that the population means differ for females and males at a 0.05 significance level.

b. 95% confidence interval:

Calculate the margin of error (ME):

ME = t_critical * SE

ME = 1.96 * 0.11

ME ≈ 0.22

Calculate the difference in means (M_diff):

M_diff = M1 - M2

M_diff = 2.99 - 2.86

M_diff = 0.13

Determine the 95% CI for the difference in means:

CI = (0.13 - 0.22, 0.13 + 0.22)

CI ≈ (-0.09, 0.35)

Since the 95% confidence interval includes zero, we cannot conclude that the population means are different without conducting the test in part a.

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Part A: Let's assume that the number you picked between 21 and 29 is 25. If the pop quiz is a total of 30 points, then your score would be 25 out of 30. To find the percentage earned, we use the following formula:

percentage = (score/total possible points) x 100%

In this case, our score is 25 and the total possible points are 30, so

percentage = (25/30) x 100%

percentage = 0.8333 x 100%

percentage = 83.33%

Therefore, if you earned 25 points out of 30 on the pop quiz, your percentage would be 83.33%.

Part B: Based on the percentage calculated in Part A, we can determine the corresponding letter grade using the grading scale provided. Since our percentage is 83.33%, it falls between the range of 80% to 89%. According to the grading scale, this corresponds to a letter grade of B.

Therefore, if you earned a score of 25 out of 30 on the pop quiz, your percentage would be 83.33% and your corresponding letter grade would be B.

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The volume of the sphere is approximately 39 cm³.

A sphere is a three-dimensional shape that is perfectly round, just like a ball. It is characterized by its radius, which is the distance from its center to any point on its surface. In your problem, the sphere has a radius of 2.1 cm, which means that every point on its surface is exactly 2.1 cm away from its center.

To find the volume of a sphere, we use the formula V = (4/3)πr³, where V is the volume, π is a mathematical constant approximately equal to 3.14, and r is the radius of the sphere.

Plugging in the values from your problem, we get:

V = (4/3)π(2.1)³

V = (4/3)π(9.261)

V = 39.082 cm³

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The measure of the supplementary angle of the given angle would be = 175.2°

A supplementary angles are those angles that sums up to 180° when added up together.

To calculate the supplementary angle represented by X;

That is,

X+ 4.8° = 180

X = 180-4.8 = 175.2°

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Answer: B A

Step-by-step explanation:

The amount that each girl receives if they receive $200 more than each boy is: $1133.33

We are told that $2800 is shared among four boys and two girls.

Thus:

Fraction of boys = 4/6 = 2/3

Fraction of girls = 2/6 = 1/3

Amount received by each boy if shared equally = (4/6) * 2800 = $1866.67

Amount received by each girl if shared equally = (2/6) * 2800 = $933.33

Now, each girl gets $200 more than each boy. Thus:

Amount each girl gets = $933.33 + $200 = $1133.33

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The number of students in class a is 15, the mean score of class c is 5.5, and the mean score of all three classes is 6.5.

In mathematics, the mean or average is a measure of central tendency that represents the typical value or a central value of a set of numbers. It is calculated by adding up all the values in the set and then dividing by the number of values in the set. The mean is commonly used in statistics to summarize a large amount of data into a single value that is more easily understood. It is often used to represent the "average" or "typical" value of a set of data. For example, the mean score of a class on a test can give an idea of how well the class performed overall.

We can use the formula for the mean to set up two equations, one for the mean score of class a and one for the mean score of all three classes:

For class a and b combined:

(6x + 25 × 8)/ (x + 25) = 7.25

Simplifying this equation gives us:

6x + 200 = 7.25(x + 25)

Expanding the brackets and simplifying further gives:

6x + 200 = 7.25x + 181.25

Subtracting 6x and 181.25 from both sides gives:

18.75 = 1.25x

Therefore, x = 15

For all three classes:

(6x + 25 × 8 + 20y) / (x + 25 + 20) = 6.5

Substituting x = 15 into this equation gives:

(6 ×15 + 25 × 8 + 20y) / (15 + 25 + 20) = 6.5

Simplifying and solving for y gives:

(90 + 200 + 20y) / 60 = 6.5

Simplifying further gives:

y = 5.5

Therefore, the number of students in class a is 15, the mean score of class c is 5.5, and the mean score of all three classes is 6.5.

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Workout of the fastest person's total time is 2 minutes 34 seconds.

Time is a concept used to describe the sequence and duration of events or changes that occur in the universe. It is a measure of the interval between two events or occurrences, and it allows us to describe and understand the order and duration of events.

In physics, time is often described as a dimension, along with the three spatial dimensions, and is often measured in units such as seconds, minutes, or hours. Time is also relative, meaning that its perception and measurement can vary depending on factors such as motion and gravity.

Overall, time is a fundamental concept in many fields, including physics, philosophy, and everyday life, and its study and understanding are crucial to our understanding of the world around us.

According to the given information:

From the given table we can observe that Ben is the fastest

Total time =53.44 + 49.79+ 50.50

                = 153.73 seconds.

Hence, total time = 2 minutes 34 seconds

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The initial exercise time is 30 minutes, so the y-intercept of the line is 30. The athlete increases their exercise time by 3 minutes each day, which means the slope of the line is 3. The correct answer is option: A.

We use the point-slope form of a line, which is y - y1 = m(x - x1), where (x1, y1) is a point on the line and m is the slope. Using the first day's exercise time as our point, we get (1, 30) as our (x1, y1) values. Substituting these values into the point-slope form and simplifying, we get y - 30 = 3(x - 1), that  is option A. Hence option A is correct.

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The calculated value of the logarithmic expression log(a⁵b⁵/c⁸) is 69

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

log a = 9

log b = -8

log c = -6

The expression to calculate is given as

log(a⁵b⁵/c⁸)

When the expression is expanded using product and quotient rules, we have

log(a⁵b⁵/c⁸) = loga⁵ + logb⁵ - logc⁸

Apply the power rule of logarithm to rewrite as

log(a⁵b⁵/c⁸) = 5loga + 5logb - 8logc

Substitute the known values in the above equation, so, we have the following representation

log(a⁵b⁵/c⁸) = 5 * 9 + 5 * -8 - 8 * -8

Evaluate

log(a⁵b⁵/c⁸) = 69

Hence, the value of the logarithmic expression log(a⁵b⁵/c⁸) is 69

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The problem "125×64" in expanded-form is written as (100 × 60) + (100 × 4) + (20 × 60) + (20 × 4) + (5 × 60) + (5 × 4).

In mathematics, the "Expanded-Form" is defined a way of representing a number as a sum of its constituent parts, usually using place value notation.

It involves expressing a number as the sum of its individual-digits or place value components, such as units, tens, hundreds, thousands, etc., multiplied by their respective place value powers of 10.

We have to write the product "125 × 64" in the expanded form,

So, the product "125 × 64" in expanded form can be written as :

⇒ 125 × 64 = (100 + 20 + 5) × (60 + 4),

⇒ (100 × 60) + (100 × 4) + (20 × 60) + (20 × 4) + (5 × 60) + (5 × 4),

Therefore, the expanded form of 125 × 64 is: (100 × 60) + (100 × 4) + (20 × 60) + (20 × 4) + (5 × 60) + (5 × 4).

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The line plot of the data points is added as an attachment

Part A:

A line plot or dot plot would be an appropriate graphical representation for this data set. A line plot would show each data point on a number line with an X above the value,

This graph would be appropriate for displaying this data because the data set is relatively small and the values are discrete (whole numbers), making it easy to see the frequency and distribution of the data points.

Part B:

To create a line plot or dot plot for this data set, you would first need to create a number line that spans the range of values in the data set.

In this case, the range of values is from 91 to 125, so the number line would include all values between these two numbers.

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Answer:

Zeroes of f(x):

x + 1 = 0, so x = -1

Vertical asymptotes of f(x):

x^2 - 4 = 0, so x = -2 and x = 2

End behavior of f(x):

As x --> negative infinity, f(x) --> 0

As x --> infinity, f(x) --> 0

No holes in f(x).

Answer:

V≈2010.62m³

Step-by-step explanation:

The average value of a necklace at Julie's shop is $57.19.

For the gold necklaces, she has 15 of them worth $120 each. So the total value of the gold necklaces is:

15 x $120 = $1,800

For the silver necklaces, she has 9 of them worth $90 each. So the total value of the silver necklaces is:

9 x $90 = $810

For the plated necklaces, she has 10 of them worth $60 each. So the total value of the plated necklaces is:

10 x $60 = $600

Finally, for the beaded necklaces, she has 30 of them worth $15 each. So the total value of the beaded necklaces is:

30 x $15 = $450

To find the total value of all the necklaces, we add up the value of each type of necklace:

$1,800 + $810 + $600 + $450 = $3,660

Now that we know the total value of all the necklaces at Julie's shop, we can find the average value of a necklace by dividing the total value by the total number of necklaces:

Average value of a necklace = Total value of all necklaces / Total number of necklaces

There are a total of 15 + 9 + 10 + 30 = 64 necklaces at Julie's shop. So the average value of a necklace is:

$3,660 / 64 = $57.19

This means that if you were to randomly select a necklace from her shop, the typical value you could expect it to have is $57.19.

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Answer:-91 is an integer

1/2 is not an integer

51 is an integer

-6/2 is not an integer

-99.34 is an integer

Step-by-step explanation: An integer is a whole number (not a fractional number) that can be positive, negative, or zero.

Answer:

-91 - yes

1/2 - no

51 - yes

-6/2 - yes

-99.34 - no

We can be 95 % confident that for smokers the pulse rate is between 3.1 and 8.9 beats per minute higher than for nonsmokers.

We are given that the total number of samples taken to observe the resting pulse rates of smokers is 26 with a mean and standard deviation of 80 bpm and 5 bpm respectively while samples taken for nonsmokers is 32 with a mean and standard deviation of 74 bpm and 6 bpm respectively.

We have independent random samples, each less than 10 % of the population, and the data appears to be approximately normal.

For smokers, n1 = 26, y1 = 80, s1 = 5

For non smokers, n2 = 32, y2 = 74, s2 = 6

t = [tex]((y1-y2) - H0)/ \sqrt{(s1^2/n1) + (s2^2/n2}[/tex]

t = [tex]((80 - 74) - 0)/ \sqrt{(5^2/26) + (6^2/32)}[/tex]

t = 4.15

P ≈ 0.0001

df ≈ 56

as the P-value is very small, the difference observed is not a sampling error. We have strong evidence of a difference in mean pulse rates for smokers and nonsmokers.

To find how big is that difference,

[tex](y1-y2)[/tex] ± t* SE(y1-y2)

= [tex](80 - 74)[/tex] ± [tex]t*(\sqrt{5^2/26 + 6^2/26})[/tex]

= (3.1, 8.29)

Therefore, we can be 95 % confident that the difference in resting pulse rates between smokers and nonsmokers is between the interval of 3.1 and 8.29 beats per minute.

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The symbolic representation of the argument is option B:

An argument in logic can be described as any group of propositions of which one is claimed to follow from the others through deductively valid deductions that preserve truth from the premises to the conclusion. Arguments in logic are typically written in symbolic language.

Considering the given statements:

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The answer to the question "difference of -72 and a product of -720?" is -9.

To find the sum of the two numbers, we can set up the following equations based on the given information:

Let the two numbers be x and y, where x > y.

x - y = -72 (since the difference between the numbers is -72)

xy = -720 (since the product of the numbers is -720)

We can solve these equations simultaneously using algebraic methods. One way to do this is to isolate one of the variables in one of the equations and substitute it into the other equation. For example, we can isolate y in the first equation by rearranging it to y = x + 72, and then substitute this into the second equation:

x(x + 72) = -720

Expanding the left-hand side, we get:

x^2 + 72x = -720

Rearranging the equation, we get:

x^2 + 72x + 720 = 0

Now we can solve for x using the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / (2a)

where a = 1, b = 72, and c = 720. Plugging in these values, we get:

x = (-72 ± √(72^2 - 4(1)(720))) / (2(1))

Simplifying further, we get:

x = (-72 ± √(5184 - 2880)) / 2

x = (-72 ± √2304) / 2

x = (-72 ± 48) / 2

Now we have two possible values for x:

x1 = (-72 + 48) / 2 = -12

x2 = (-72 - 48) / 2 = -60

Since x > y, we take x = -12 and y = -72 - (-12) = -60 + 12 = -48.

Thus, the sum of the two numbers is -9, which is obtained by adding x and y:

-12 + (-48) = -9.

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Length of the new rectangle = 28 x 2 = 56,Width of the new rectangle = 7 x 2 = 14These are indeed the dimensions of the new rectangle we considered, so we can conclude that it is similar to the given rectangle.

How to solve the question?

In order for two rectangles to be similar, their corresponding sides must be in proportion. This means that the ratio of the length to the width in one rectangle must be equal to the ratio of the length to the width in the other rectangle.

Let's consider a rectangle with a length of 56 and a width of 14. We can check if this rectangle is similar to the given rectangle by calculating the ratio of the length to the width in each rectangle:

Ratio in the given rectangle = 28/7 = 4

Ratio in the new rectangle = 56/14 = 4

As we can see, the ratio of the length to the width is the same in both rectangles. Therefore, the rectangle with a length of 56 and a width of 14 is similar to the given rectangle.

To confirm this, we can calculate the dimensions of the new rectangle by scaling up the dimensions of the given rectangle by a factor of 2. That is, we can multiply the length and width of the given rectangle by 2:

Length of the new rectangle = 28 x 2 = 56

Width of the new rectangle = 7 x 2 = 14

These are indeed the dimensions of the new rectangle we considered, so we can conclude that it is similar to the given rectangle.

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the given equation y = 2.81x² represents a non-proportional situation because the output variable y is not directly proportional to the input variable x.

HOW TO SOLVE THE QUESTION?

The given equation y = 2.81x² represents a non-proportional situation because the output variable y is not directly proportional to the input variable x. In a proportional relationship, when one variable increases or decreases, the other variable changes in direct proportion to it. However, in this equation, the output variable y increases at a non-linear rate as the input variable x increases.

A proportional relationship between two variables is characterized by a constant ratio between the two variables, which means that if one variable is doubled, the other variable is also doubled. In this case, the coefficient of x² is not a constant value, which indicates that the ratio between y and x² is not constant. Therefore, the given situation is not proportional.

Furthermore, a non-proportional relationship between two variables may exhibit a curved or nonlinear relationship between the variables, as in the case of this equation where y increases at an increasing rate as x increases. Therefore, the given situation can be categorized as non-proportional.

In conclusion, the given equation y = 2.81x² represents a non-proportional situation because the output variable y is not directly proportional to the input variable x.

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The complex number with the greatest modulus is given as follows:

z1.

A complex number is a number that is composed by a real part and an imaginary part, as follows:

z = a + bi.

In which:

The modulus of the complex number is obtained as follows:

|z| = sqrt(a² + b²).

On the coordinate plane, we have that:

In this problem, we have that the complex number z1 has both the highest absolute value in the x-coordinate and in the y-coordinate, thus it has the largest modulus.

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The Domain of the function is = (-∞, 0) U (0, ∞)

The Range of the function is = (-∞, 0] U [0, ∞)

A function that is defined by various mathematical formulas or rules for various segments or intervals of its domain is known as a piecewise function.

In other words, the function is specified piece by piece, with a formula or rule for each individual piece.

When a single formula or rule is unable to adequately capture the behaviour of the function across the entire domain, a piecewise function is frequently used.

The various components of the function may take on various algebraic forms or may merely describe various functions' behaviours or conditions.

The given piecewise function is defined as:

f(x) = x, x > 0

f(x) = 0, x = 0

f(x) = -x, x < 0

Domain:

The domain of a function is the set of all values of x for which the function is defined. In this case, the function is defined for all real numbers except for x = 0 (where there is a discontinuity due to the change in definition).Therefore The function's domain is (-, 0). U (0, ∞).

Range:

The set of all possible values for a function is known as its range. Looking at the given function, we can see that the function takes on all positive values for x > 0, and all negative values for x < 0. At x = 0, the function takes on the value 0. Therefore, The function's range is [-, 0]. U [0, ∞)

Note that the range includes 0, since the function takes on this value at x = 0.

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Answer: 24

Step-by-step explanation:

n = 12^2

n + 1 = 13^2

2n = 12

Transpose the 2 on the other side, you get -

n = 12*2

Therefore, n = 24

The absolute maximum value of g(x) on the interval [-4,1] is approximately 4.4817, which occurs at x = 1.

To find the absolute maximum value of g(x) on the interval [-4,1], we need to evaluate the function at both the endpoints and at any critical points inside the interval, and then compare the values to determine the maximum.

First, let's evaluate g(x) at the endpoints of the interval

g(-4) = (-4² + 4 + 1)e^(-4) ≈ 0.00064

g(1) = (1² - 1 + 1)e^1 ≈ 4.4817

Next, we need to find any critical points of g(x) inside the interval. To do this, we take the derivative of g(x) and set it equal to zero

g'(x) = (2x - 1 + (x² - x + 1))e^x = (x² + x - 1)e^x

Setting g'(x) = 0, we get

x² + x - 1 = 0

Using the quadratic formula, we get

x = (-1 ± sqrt(5))/2

Both of these critical points, approximately -1.618 and 0.618, are inside the interval [-4,1], so we need to evaluate g(x) at these points as well:

g(-1.618) ≈ 0.4963

g(0.618) ≈ 2.5305

Now we can compare the values of g(x) at the endpoints and critical points to determine the absolute maximum

g(-4) ≈ 0.00064

g(-1.618) ≈ 0.4963

g(0.618) ≈ 2.5305

g(1) ≈ 4.4817

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The given question is incomplete, the complete question is:

Let g be the function defined by g(x)=(x²- x+1)e^x. What is the absolute maximum value of g on the interval [-4,1] ?

After answering the presented question, we may conclude that  So the surface area of the ramp, including the front and sides, is 42 square feet.

The surface area of an object indicates the overall space occupied by its surface. The surface area of a three-dimensional form is the entire amount of space that surrounds it. The surface area of a three-dimensional form refers to its full surface area. By summing the areas of each face, the surface area of a cuboid with six rectangular faces may be computed. As an alternative, you may use the following formula to name the box's dimensions: 2lh + 2lw + 2hw = surface (SA). Surface area is a measurement of the total amount of space occupied by the surface of a three-dimensional object (a three-dimensional shape contains height, breadth, and depth).

To find the surface area of the ramp, we need to calculate the area of each face and add them up.

The front face is a rectangle with dimensions 6 ft by 4 ft, so its area is:

Area of front face = length * width = 6 ft * 4 ft = 24 ft²

The two side faces are right triangles with base 6 ft and height 3 ft. The area of each triangle is:

Area of one side face = 1/2 * base * height = 1/2 * 6 ft * 3 ft = 9 ft²

Since there are two side faces, the total area of the side faces is:

Area of side faces = 2 * Area of one side face = 2 * 9 ft² = 18 ft²

Therefore, the total surface area of the ramp is:

Surface area = Area of front face + Area of side faces = 24 ft² + 18 ft² = 42 ft²

So the surface area of the ramp, including the front and sides, is 42 square feet.

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Answer:

the answer ur looking for would be B

Step-by-step