how is this simplified? what number do you divide with to get the answer​

Answer:

Step-by-step explanation:

Hello!

Given the regression equation

Credit= 17.9 - 0.09 Work

That was estimated from a sample of n= 21 statistic students.

Y: number of college credits taken

X: number of hours worked per week at an outside job

a)

The estimation for the slope is -0.09

As you see the estimated slope is negative, this means that the association between the two variables is indirect or inverse. Meaning, when the number of Work increases, the number of Credit decreases. (negative regression)

The correct option is: "An increase in the number of hours worked per week decreases the expected number of credits."

b)

The estimation for the intercept is 17.9

In general, the intercept is the estimated average of Y when X=0. You can interpret the intercept of this equation as "the value of Credits earned by a student that does not work outside of school"

The correct option is: " The intercept is meaningful as a student may not have a job outside of school. "

c)

If Work=0, then Credit= 17.9 (As explained in item b)

By replacing the value in the equation: Credit= 17.9 - 0.09 * 0= 17.9

If Work=60, you replace it in the equation and:

Credit= 17.9 - 0.09 Work= 17.9-0.09*60= 12.5

If the student works 60 hs outside of school it is expected that he takes 12.5 college credits.

I hope this helps!

The correct answers are that an increase in work hours decreases the number of expected credits, the intercept is meaningful as it represents the credits for a student not working, and credits equal to 17.9 when work hours are zero and 12.5 when work hours are 60.

The regression equation given is Credits = 17.9 - 0.09 Work, where Credits is the number of college credits taken and Work is the number of hours worked per week at an outside job.

(a) From this equation, we can see that for an increase in the number of hours worked (Work), the number of expected credits (Credits) decreases because the coefficient of Work is negative (-0.09). So, the correct statement is: An increase in the number of hours worked per week decreases the expected number of credits.

(b) Regarding the intercept, it is meaningful since it represents the expected number of credits a student would take if they did not work at all (Work = 0). Therefore, the correct option is: The intercept is meaningful as a student may not have a job outside of school.

(c) If Work = 0, then Credits = 17.9. If Work = 60, then Credits = 17.9 - 0.09(60) = 17.9 - 5.4 = 12.5.

Answer:

(36/4)-(36/9)=5

(8x3)-12=12

Step-by-step explanation:

36/4=9, 36/9=4, and 9-4=5

8x3=24 and 24-12=12

Answer:

-5

Step-by-step explanation:

when you multiply a number by -1 it becomes its opposite

Answer:

.00227 or 5/2197

Step-by-step explanation:

following the basic rules of PEMDAS, we know that we have to solve for the exponent first.

so.... 5/2197

as a decimal, this is .00227...

Answer:

48 dollars

Step-by-step explanation:

grant originally had 36 and john had 12

decrease grant by 9 and increase john by 9

grant has 27, and john has 21

difference is 6 so the sum is 48.

Answer:

48 dollars

Step-by-step explanation:

Total money of Grant : 36

Total money of John : 12

Grant gave 9 dollars to John : 36 - 9 = 27

Now John has 21 dollars ( 12 + 9 = 21 )

So , 21 + 27 = 48

Thus , John and Grant have 48 dollars in total

Final answer:

The test statistic for this hypothesis is the Z-score. The television network should reject H0 and the correct hypotheses to test are H0: p = 0.50 and HA: p > 0.50.

Explanation:

a. The test statistic for this hypothesis would be Z-score.

b. To calculate the critical value at α = 0.10, you can use a Z-table. Look up the value corresponding to an alpha of 0.10 in the one-tailed column. The critical value would be the corresponding Z-score.

c. The television network should reject H0, as the p-value is less than the significance level of 0.10. This means there is enough evidence to suggest that viewers prefer the new show over the current lineup.

d. The correct hypotheses to test would be H0: p = 0.50 and HA: p > 0.50, as the network wants to determine if the proportion of viewers who prefer the new show is greater than 0.50.

Answer:

it would be A. -25

Step-by-step explanation:

`for example if she sold 0 dollars worth of necklaces and she spent 25 dollars on supplies she would have lost 25 dollars so it would be -25.

Answer:A,-$25

Step-by-step explanation:

She bought the necklace. When she sold it, she sold it for $25 less than what she bought it for. Therefore, she lost $25, the same as -$25.

Answer:

Correct option: (b).

Step-by-step explanation:

The correlation coefficient is a statistical degree that computes the strength of the linear relationship between the relative movements of the two variables (i.e. dependent and independent). It ranges from -1 to +1.

Negative correlation is a relationship amid two variables in which one variable rises as the other falls, and vice versa. A positive correlation occurs when one variable declines as the other variable declines, or one variable escalates while the other escalates.

In statistics, a perfect positive correlation is represented by +1 and -1 indicates a perfect negative correlation.

The closer the correlation value is to 1 the stronger the relationship between the two variables.

Let,

X = car weight

Y = car reliability

Z = annual maintenance cost

It is provided that:

Corr. (X, Y) = -0.30

Corr. (X, Z) = 0.20

The correlation coefficient of car weight and car reliability is negative. This implies that there is a negative relation between the two variables, i.e. as the weight of the car increases the reliability decreases and vice-versa.

And the correlation coefficient of car weight and annual maintenance cost is positive. That is, the two variables move in the same direction, i.e. as the weight of the car increases the annual maintenance cost also increases.

The correlation coefficient value of (X, Y) is closer to 1 than that of (X, Z).

This implies that the relationship between car weight and car reliability is much more stronger that the relationship between car weight and annual maintenance cost.

Thus, all the provided statement are correct.

Hence, the correct option is (b).

Final answer:

The correlations indicate that heavier cars tend to be less reliable and cost more to maintain. (option b)  I, II, and III.

Explanation:

The given correlations between car weight and car reliability (-0.30) and car weight and annual maintenance cost (0.20) can be used to determine the relationship between these variables.

I. Heavier cars tend to be less reliable.

Based on the given correlations, the following statements are true:

Therefore, the correct answer is (option b)  I, II, and III.

Answer:

27%

Step-by-step explanation:

Jaylon spent 27% of his birthday money.

Answer:

27%

Step-by-step explanation:

To find the percent spent, take the amount spent and put it over the total

21.60 /80

.27

Multiply by 100% to put in percent form

27%

I hope this helps you

Answer:

Step-by-step explanation:

The associative property is helpful while adding or multiplying multiple numbers. By grouping, we can create smaller components to solve. It makes the calculations of addition or multiplication of multiple numbers easier and faster. Here, adding 17 and 3 gives 20.

the identity property of 1 says that any number multiplied by 1 keeps its identity. In other words, any number multiplied by 1 stays the same. The reason the number stays the same is because multiplying by 1 means we have 1 copy of the number.

Answer:

14

Step-by-step explanation:

M = (13+8+12+10+27)/5

= 70/5

= 70 : 5

= 14

Answer:

False

Step-by-step explanation:

Substitute 13 in for c

c - 12 > 30

13 - 12 > 30

1 > 30

This is false, because 1 is not greater than 30

The solution:

c - 12 > 30

Add 12 to both sides

c  > 42

Answer:

1/4 25%

Step-by-step explanation:

The spinner has 4 sides so the denomination is 4 and you are trying to get one of the 4 sides each so it would be a 1/4 chance for both answers so 25%

Answer:$0.45

Step-by-step explanation:

Multiply 2.75 by .075 then multiply 3.25 by .075 and add them together

The sales tax amount of the breakfast is A = $ 0.45

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the equation be represented as A

Now , the value of A is

Substituting the values in the equation , we get

To find the sales tax on the coffee and muffin, we first need to find the total cost of the items before tax:

Total cost = Cost of coffee + Cost of muffin

= $2.75 + $3.25

= $6.00

Next, we can calculate the sales tax by multiplying the total cost by the tax rate:

Sales tax = Total cost x Tax rate

On simplifying the equation , we get

A = $6.00 x 0.075

A = $0.45

Hence , the sales tax on the coffee and muffin is $0.45

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Answer:

Amy

Step-by-step explanation:

amy completed a longer distance in a shorter amount of time

rather than john completed a shorter distance in a longer time

pls mark me brainliest

Amy runs faster than John.

Speed is defined as the ratio of distance of an object to the time taken to complete the distance.

Speed of any object can be calculated by the equation,

Speed = Distance / Time

Here, Speed of Amy = 150/50 = 3

         Speed of John = 120/400 = 0.3

Amy runs at a speed of 3 meters per seconds and John runs at a speed of 0.3 meters per second.

Hence Amy runs faster than John.

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Answer:

8 * (9 - 2 -3) = 32

Step-by-step explanation:

8 * (9 - 2 - 3)

8 * (4)

32

Answer:

8x(9-2-3) = 32

Step-by-step explanation:

8x9-2-3 = 32

We need 8*4 to get to 32

so 9 -2-3 need to equal 4

That means we need the parentheses around this term because

9-2 = 7

7-3 =4

8x(9-2-3) = 32

Answer:

22.7

Step-by-step explanation:

To find the mean absolute deviation (MAD), first find the mean (or average).

μ = (5 + 24 + 38 + 52 + 66 + 85) / 6

μ = 45

Next, subtract the mean from each value and take the absolute value.

|5 − 45| = 40

|24 − 45| = 21

|38 − 45| = 7

|52 − 45| = 7

|66 − 45| = 21

|85 − 45| = 40

Sum the results and divide by the number of animals.

MAD = (40 + 21 + 7 + 7 + 21 + 40) / 6

MAD ≈ 22.7

Answer:

- pentagon area= 6.9

-hexagon area=10.4

Answer:

Pentagons: 6.9 square inches

Hexagons: 10.4 square inches

Step-by-step explanation: i got it right on edge

Answer:

[tex]S_{1 } (x,y) = (0.333, 0.815)[/tex] (Absolute minimum) and [tex]S_{2} (x,y) = (-1, 2)[/tex] (Absolute maximum)

Step-by-step explanation:

The critical points are determined with the help of the First Derivative Test:

[tex]f'(x) = 3\cdot x ^{2} +2\cdot x -1[/tex]

[tex]3\cdot x^{2} + 2\cdot x - 1 = 0[/tex]

The critical points are:

[tex]x_{1} \approx 0.333[/tex] and [tex]x_{2} \approx -1[/tex]

The Second Derivative Test offers a criterion to decide whether critical point is an absolute maximum and whether is an absolute minimum:

[tex]f''(x) = 6\cdot x +2[/tex]

[tex]f''(x_{1}) = 3.998[/tex] (Absolute minimum)

[tex]f''(x_{2}) = -4[/tex] (Absolute maximum)

The critical points are:

[tex]S_{1 } (x,y) = (0.333, 0.815)[/tex] (Absolute minimum) and [tex]S_{2} (x,y) = (-1, 2)[/tex] (Absolute maximum)

The global maximum is at x = -1 with f(-1) = 2, and the global minimum is at x = -2 with f(-2) = -1.

To find the global and local maxima and minima of the function f(x) = [tex]x^3 + x^2[/tex] − x + 1 over the interval [-2, 1/2], follow these steps:

Find critical points: First, we need to find the derivative of the function f(x):

f'(x) = [tex]3x^2[/tex]+ 2x - 1

Solve f'(x) = 0 to find critical points within the interval:

[tex]3x^2[/tex]+ 2x - 1 = 0

Using the quadratic formula x = (-b ± √(b²-4ac)) / 2a, where a = 3, b = 2, and c = -1:

x = [-2 ± √(4 + 12)] / 6

x = [-2 ± 4] / 6

This gives two solutions:

x = 1/3 and x = -1

Both are within the interval [-2, 1/2], so we consider these as critical points.

Second Derivative Test (SDT): Find the second derivative to apply the SDT:

f''(x) = 6x + 2

Evaluate f''(x) at the critical points:

f''(-1) = 6(-1) + 2 = -4 (which is negative, indicating a local maximum)

f''(1/3) = 6(1/3) + 2 = 4 (which is positive, indicating a local minimum)

Evaluate the function at the endpoints: Compute f(x) at the bounds of the interval:

f(-2) = (-2)³ + (-2)² - (-2) + 1 = -8 + 4 + 2 + 1 = -1

f(1/2) = (1/2)³ + (1/2)² - (1/2) + 1 = 1/8 + 1/4 - 1/2 + 1 = 7/8

Additionally, compute the function at the critical points:

f(-1) = (-1)³ + (-1)² - (-1) + 1 = -1 + 1 + 1 + 1 = 2

f(1/3) = (1/3)³ + (1/3)² - (1/3) + 1 = 1/27 + 1/9 - 1/3 + 1 ≈ 0.963

Interpret the results:

The maximum and minimum values for f(x) over [-2, 1/2] are:

Local maximum at x = -1 with f(-1) = 2

Local minimum at x = 1/3 with f(1/3) ≈ 0.963

Global maximum at x = -1 with f(-1) = 2

Global minimum at x = -2 with f(-2) = -1

Answer:

This is a Right Triangle

Step-by-step explanation:

12=a 16=b 20=c

Now lets solve

a^2+b^2=c^2

144+b^2=c^2

144+256=c^2

144+256=400

c^2=400

The square root of 400 is 20..

This IS a Right Triangle

Yes, a triangle with sides of lengths 12ft, 16ft and 20ft is a right triangle. This is proven by using the Pythagorean theorem, which these side lengths satisfy.

To verify if a triangle is a right triangle, you can use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. This can be written as: a² + b² = c².

In the triangle you provided with sides of lengths 12 ft (a), 16 ft (b), and 20 ft (c, as the hypotenuse is usually the longest side), you would plug those values into the equation: 12² + 16² = 20²?

144 + 256 = 400?

400 = 400

Because the equation is true, this proves that the triangle is indeed a right triangle.

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Answer:

Correct

Step-by-step explanation:

1. Factors

Are whole numbers that can divide the number completely.

2. Prime number

Number of factors that can be express in form of prime factorisation.

Prime factorisation of a number can be done by repeated division by prime numbers (number is written as the product of its prime factors)

For example, 17

List of factors, 1 and 17

Prime number, 17

Prime factorisation, 1×17=17

So why prime numbers cannot be express in form of prime factorisation?

Because, a prime number can only be divided by 1 or itself, so it cannot be factored any further. Not like the other number.

Brainliest would be appreciated :)

Final answer:

The student is incorrect; 17 is a prime number, and the only prime factor of 17 is 17 itself. The number 1 is not considered a prime factor as it is not a prime number.

Explanation:

No, the student is not correct in stating that the prime factors of 17 are 1 and 17. Prime factors are numbers that are both prime and divide the original number without leaving a remainder. The definition of a prime number is a number greater than 1 that has no positive divisors other than 1 and itself. In the case of 17, it is indeed a prime number, so it cannot have any prime factors other than itself. Therefore, the only prime factor of 17 is 17.

The number 1 is not considered a prime factor, as it is not a prime number because it does not meet the basic criterion of having exactly two distinct natural number divisors: 1 and itself. Examples of prime factors can be seen in other numbers, such as 15, whose prime factors are 3 and 5, both of which are prime numbers that divide 15 without leaving a remainder. In contrast, 17 can only be divided evenly by 1 and 17, and since 1 is not a prime number, 17 is the sole prime factor of 17.

Only the volume is given, so you can already assume the rectangular prism is a cube, which in that case you can divide by 3 to get the answer.

Answer:

5 a) PMT=$1,465.60

b) Total Payments=$527,616

c) Total Interest=$331,616

6a) Interest=$1,079.93

b) Principal=$584.07

Step-by-step explanation:

a. Given the loan amount is $196,000, annual rate is 8.2% and the loan term is 30 years.

-The monthly mortgage payment can be calculated as follows:

[tex]PMT=A(\frac{(r/n)}{1-(1+\frac{r}{n})^{-nt}})[/tex]

Where:

-We substitute to solve for PMT:

[tex]PMT=A(\frac{(r/n)}{1-(1+\frac{r}{n})^{-nt}})\\\\=196000[\frac{(0.082/12)}{1-(1+\frac{0.082}{12})^{-12\times30}}]\\\\=\$1,465.60[/tex]

Hence, the monthly mortgage payment is $1,465.60

b. The total number of payments is obtained by multiplying the total number of payments by the amount of each payment:

[tex]\sum(payments)=PMT\times nt\\\\=1465.60\times 12\times 30\\\\=\$527,616.00[/tex]

Hence, the total amount of payments is $527,616

c. The amount of interest paid over the loan's term is obtained  by subtracting the principal loan amount from the total payments made:

[tex]Interest=Payments-Principal\\\\=527,616.00-196,000.00\\\\=\$331,616[/tex]

Hence, an interest amount of $331,616 is paid over the loan's term.

6 a) We first obtain the effective loan amount by subtracting the down-payment:

[tex]Loan \ Amount= Regular \ Price -Downpayment\\\\=205700-0.1(205700)\\\\=\$185,130[/tex]

The interest paid on the first mortgage payment is calculated as below:

[tex]I=\frac{r}{n}\times P\\\\I=Interest\\r=interest \ rate\\n=Payments \ per \ year\\P=Outstanding \ loan \ balance\\\\\therefore I=\frac{0.07}{12}\times 185130\\\\=\$1,079.93[/tex]

Hence, the amount of interest in the first payment is $1,079.93

b. The amount of principal repaid is obtained by subtracting the interest amount from the monthly mortgage payments;

[tex]Principal \ Paid=PMT-Interest\\\\PMT=A[\frac{(r/n)}{1-(1+\frac{r}{n})^{-nt}}]\\\\=185130[\frac{(0.07/12)}{1-(1+\frac{0.07}{12})^{-180}}\\\\=1664.00\\\\\\Principal \ Paid=1664.00-1079.93\\\\=\$584.07[/tex]

Hence, the amount of principal applied is $584.07

Answer:

40

Step-by-step explanation:

Answer:

One thing that is alike is that both expressions start off as a division statement/fraction

Step-by-step explanation:

One things that is not alike is that Expression A has 3 variables while Expression B doesn't.

a. Salt flows into tank A at a rate of

(y(t)/500 lb/gal) * (50 gal/min) = y(t)/10 lb/gal

and out at a rate of

(x(t)/500 lb/gal) * (50 gal/min) = x(t)/10 lb/gal

so the net rate of change of the amount of salt in tank A is

[tex]x'(t)=\dfrac{y(t)}{10}-\dfrac{x(t)}{10}[/tex]

Similarly, you would find

[tex]y'(t)=\dfrac{x(t)}{10}-\dfrac{y(t)}{10}[/tex]

b. We have

[tex]x'=-\dfrac x{10}+\dfrac y{10}\implies x''=-\dfrac{x'}{10}+\dfrac{y'}{10}[/tex]

Notice that x' = -y', so

[tex]x''=-{2x'}{10}\implies 5x''+x'=0[/tex]

Solve for x: the characteristic equation

[tex]5r^2+r=r(5r+1)=0[/tex]

has roots [tex]r=0[/tex] and [tex]r=-\frac15[/tex], so

[tex]x(t)=C_1+C_2e^{-t/5}[/tex]

Again using the fact that y' = -x', we then find

[tex]x'(t)=-\dfrac{C_2}5e^{-t/5}\implies y'(t)=\dfrac{C_2}5e^{-t/5}\implies y(t)=C_1-C_2e^{-t/5}[/tex]

Given that x(0) = 0 and y(0) = 10, we find

[tex]\begin{cases}0=C_1+C_2\\10=C_1-C_2\end{cases}\implies C_1=5,C_2=-5[/tex]

Answer:

Correct option: (A) p₁ - p₂ < 0.

Step-by-step explanation:

The claim made by the scientist is that the proportion of female members of the National Academy of Sciences is less than the proportion of female members nationwide.

To test this claim we can difference between two proportions z-test.

It is assumed that p₁ is the proportion of women in the National Academy of Sciences and p₂ is the proportion of women nationwide.

Then we nee to test whether p₁ - p₂ < 0 or not.

The hypothesis can be defined as:

H₀: The proportion of women in the National Academy of Sciences is not less than the proportion nationwide, i.e. p₁ - p₂ ≥ 0.

H₀: The proportion of women in the National Academy of Sciences is less than the proportion nationwide, i.e. p₁ - p₂ < 0.

Thus, the correct option is (A).

Answer:

sorry bro i sant yo eran poinst

Step-by-step explanation:

jajajajajjaja

Answer:

a) 44

b) 64

Step-by-step explanation:

Applying the central limit theorem, the proportion of the random sample of 25 years old or older that have earned at least a​ bachelor's degree will be equal to the population proportion of 23%.

Mean = np

Mean = 10

p = 0.23

n = ?

10 = n×0.23

N

n = (10/0.23) = 43.5 = 44 to the nearest whole number.

b) This is a binomial distribution problem with the probability known and the number of trials unknown.

Binomial distribution function is represented by

P(X = x) = ⁿCₓ pˣ qⁿ⁻ˣ

n = total number of sample spaces = ?

x = Number of successes required = 10

p = probability of success = 0.23

q = probability of failure = 1 - 0.23 = 0.77

P(X ≥ 10) = 0.945

P(X ≥ 10) = 1 - P(X < 10) = 1 - [P(X=0) + P(X=1) + P(X=2) + P(X=3) + P(X=4) + P(X=5) + P(X=6) + P(X=7) + P(X=8) + P(X=9)]

0.945 = 1 - [Σ P(X=x)] (with the summation of x from 0 to 9)

Using the trial and error method on the binomial distribution formula calculator, n is obtained to be 64.

Hope this Helps!!!

Final answer:

To have a high likelihood of sampling at least 10 people with a bachelor's degree, using the survey information that 23% of the population holds such a degree, you would want to sample about 44 individuals. For a probability of 0.945 of having at least 10 degree-holders in your sample, you would need to sample approximately 28 individuals.

Explanation:

Considering the survey indicating that 23% of residents 25 years old or older have earned at least a bachelor's degree, to ensure at least 10 people in a study have a bachelor's degree, you would ideally use the proportion of the population with this degree to determine the size of the sample needed.

Expected Sample Size

If you are selecting individuals at random and want to calculate the expected number of people you need to sample to find 10 people with a bachelor's degree, you divide the number of people needed by the probability of an individual having a bachelor's degree. In mathematical terms, you are expected to sample 10 / 0.23 ≈ 43.48, which we round up to the next whole number, giving us 44 people.

Sample Size for Desired Probability

To achieve a probability of 0.945 that your sample contains at least 10 people with a bachelor's degree, you would utilize statistical methods or software that applies the binomial or hypergeometric distribution formulas. This question seems to indicate that the answer is 28 individuals, which suggests that a calculation has already been made to determine this number.