MATHEMATICS HIGH SCHOOL

Find the unit rate:

$2 for 5 cans of dog food

Answers

Answer 1
Answer: .40$/1 is the answer to your question
Answer 2
Answer: .40 per can
2/5 = .4

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What is the y-intercept of the line represented by the equation below?
y = –2x – 1

Answers

general form is y = mx + c  where c = y-intercept

so here the y-intercept is -1

Which set of integers is included in (-1,3]?(1) {0,1,2,3} (3) {-1,0,1,2,3,4}
(2) {-1,0,1,2} (4) {-2,-1,0,1,2,3}

Answers

Hello,

N={0,1,2,3,4,5,...}

(-1,3]={0,1,2,3}⊂N

Answer (1) no negative whole numbers.

3x2 − y3 − y3 − z if x = 3, y = −2, and z = −5.

Answers

Plug in each variable:
3(3)²-(-2)³-(-2)³-(-5)
3(9)-(-8)-(-8)+5
27+21
The answer is 48

In a sample of 50 households, the mean number of hours spent on social networking sites during the month of January was 45 hours. In a much larger study, the standard deviation was determined to be 8 hours. Assume the population standard deviation is the same. Which of the statement below best describes that there is a 95% confidence interval for the mean hours devoted to social networking in January? A. The 95% confidence interval ranges from 8 to 45 hours. B. The 95% confidence interval ranges from 40.13 to 45.78 hours. C. The 95% confidence interval ranges from 43.87 to 46.13 hours. D. The 95% confidence interval ranges from 42.78 to 47.22 hours.

Answers

Answer:

D. The 95% confidence interval ranges from 42.78 to 47.22 hours.

Step-by-step explanation:

In a sample of 50 households, the mean number of hours spent on social networking sites during the month of January was 45 hours. In a much larger study, the standard deviation was determined to be 8 hours.

Here,

n = sample size = 50,

μ = mean = 45,

σ = standard deviation = 8,

We know that, confidence interval will be,

=\mu\ \pm\ z(\sigma )/(√(n))

For a confidence interval of 95%, we use z = 1.96, putting the values

=45\ \pm\ 1.96(8)/(√(50))

=42.78,47.22
D. The 95% confidence interval ranges from 42.78 to 47.22 hours.

To solve the interval, we used the upper and lower limit formulas wherein:
xbar = 45
z = 1.96
s = 8
n = 50

Can some one help me find the x in this problem 19+7x​

Answers

Answer:

x=-2(5)/(7)

Step-by-step explanation:

19+7x\n

Subtract 19 both sides.

19-19+7x=-19\n0+7x=-19\n7x=-19

Divide 7 on both sides to isolate x.

(7x)/(7)=(-19)/(7)     -->  x=-(19)/(7)

Transform form improper to proper form.

-(19)/(7)=-2(5)/(7)\nx=-2(5)/(7)

-85 minus -16


HELP!!!!

Answers

-85-16 is equal to -101

I like to treat this as an addition problem to make it sound simple (may only apply to both being negative)

Ask yourself what is 85+16?
101

The question is asking the opposite negative version of it, meaning add a negative to change your answer to -101 as the final answer.

Answer:-69

Step-by-step explanation:-85 - -16 would be changed to -85+16 because there are two minus signs next to eachother.
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