Roxanne wants to save up enough money so that she can buy a video game. The game costs $59. Roxanne has $22 saved from mowing the grass. In order to make more money, she plans to pressure wash her neighbors’ driveways. She plans to charge $5 for each driveway she pressure washes, and any extra money she makes beyond $59 she will save to buy another video game. How many driveways does she need to pressure wash to reach her goal?

Answers

Answer 1
Answer: Roxanna will have to wash 8 driveways giving her a total of $62 to go towards her new video game. She’ll have $3 left over.

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According to a past survey, 23% of Americans have hypertension. After a stringent regimen of diet and exercise, 75 people were then tested and 18 were found to have hypertension. Based on this sample, does diet and exercise reduce hypertension? Use a significance level of 0.05.a) yesb) no

Answers

Answer:No, Diet and exercise does not reduce hypertension.

Step-by-step explanation:

Since we have given that

p = 0.23

n = 75

x = 18

So, \hat{p}=(x)/(n)=(18)/(75)=0.24

So, hypothesis would be

H_0:p=\hat{p}\n\nH_a:\hat{p}<p

So, the test statistic value would be

z=\frac{\hat{p}-p}{\sqrt{(p(1-p))/(n)}}\n\nz=\frac{0.24-0.23}{\sqrt{(0.23* 0.77)/(75)}}\n\nz=(0.01)/(0.049)\n\nz=0.204

At α = 0.05 level of significance, we get

critical value = 1.96

and 1.96>0.204.

so, we will accept the null hypothesis.

Hence, No, Diet and exercise does not reduce hypertension.

Write an equation of a line that passes through (-3,1), perpendicular to Y=-3x-3

Answers

Answer:

4

Step-by-step explanation:

  • To be perpendicular, the product of the slope is -1.
  • (x,y) Substituting the coordinates.
  • y= 1/3(x+3) + 1
  • y= 1/3x +2

Answer:

your answer is correct

Step-by-step explanation:

the first one is the correct answer

6^3x=14 Show your work

Answers

Answer:

Is 3x supposed to be an exponent?

Step-by-step explanation:

Both possible answer are provided

3x as an exponent and as 6 times 3x

Assume that you plan to use a significance level of α = 0.05 to test the claim that p1 = p2. Use the given sample sizes and numbers of successes to find the pooled estimate. Round your answer to the nearest thousandth. n1 = 677 n2 = 3377
x1 = 172 x2 = 654

Answers

Answer:

The calculated  value Z = 3.775 > 1.96 at 0.05 level of significance

Null hypothesis is rejected

The Two Population proportion are not equal

Step-by-step explanation:

Given first sample size n₁ = 677

First sample proportion

                             p^(-) _(1) = (x_(1) )/(n_(1) ) = (172)/(677) = 0.254

Given second sample size n₂ = 3377

second sample proportion

                             p^(-) _(2) = (x_(2) )/(n_(2) ) = (654)/(3377) = 0.1936

Null Hypothesis : H₀ :  p₁ = p₂.

Alternative Hypothesis : H₁ :  p₁ ≠ p₂.

      Test statistic

                Z = \frac{p_(1) ^(-)-p^(-) _(2)  }{\sqrt{P Q((1)/(n_(1) ) +(1)/(n_(2) )) } }

where

        P = (n_(1) p_(1) + n_(2) p_(2)  )/(n_(1)+n_(2)  ) = (677 X 0.254+3377 X 0.1936)/(677+3377)

       P =  0.2036

      Q = 1 - P = 1 - 0.2036 = 0.7964

       

         Z = \frac{0.254- 0.1936 }{\sqrt{0.2036 X 0.7964((1)/(677 ) +(1)/(3377 )) } }

        Z =  3.775

Critical value ∝=0.05

Z- value = 1.96

The calculated  value Z = 3.775 > 1.96 at 0.05 level of significance

Null hypothesis is rejected

The Two Population proportion are not equal

Which expression has a negative value?−3×3×−3×−3×−3

−3×−3×3

−3×3×−3×−3

−3×−3

Answers

Step-by-step explanation:

A - 3×3×-3×-3×-3 = 243

B - 3×-3×3 = 27

C - 3×3×-3×-3 = -81

D - 3×-3 = 9

The correct option is C

Answer: answer is c

Step-by-step explanation:

How many meters are in 100 millimeters? 1
10
0.1
100​

Answers

Answer:

0.1

Step-by-step explanation:

divide the length value by 1000