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SVETLANKA909090 [29]
2 years ago
10

Robert wants to install windows in a bus barn to improve the airflow in the summer months. If Robert makes his own screens, he c

an save money. To have screen material to fold over the window frame, Robert needs to cut 5 1/2 foot by 5 1/2 foot squares. The back wall by the offices requires four windows. For a good cross-flow of air, Robert will build five windows on each of the ohter two walls of the barn. How many square inches of screen will be needed for all of the windows?
Mathematics
1 answer:
DedPeter [7]2 years ago
8 0
=1/2

you add both on each side then subtract 2 from you anser

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24 - 7/8 I’m taking a test so I don’t have much time.
HACTEHA [7]

Answer:

23.125

Step-by-step explanation:

7/8= 0.875

24-0.875=23.125

3 0
3 years ago
Six more than the product of seven and a number is 55.
mariarad [96]

Answer:

7x + 6 = 55; x=7

Step-by-step explanation:

"six more than" -> +6

"product of seven and a number" -> 7x

7x + 6 = 55

7x = 55 - 6

7x = 49

x=7

8 0
3 years ago
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According to the National Institute on Drug Abuse, a U.S. government agency, 17.3% of 8th graders in 2010 had used marijuana at
miskamm [114]

Answer:

The conditions for use of the normal model to represent the distribution of sample proportion are not met. He should increase the sample size until the conditions are met.

If the test is done anyway, the null hypothesis failed to be rejected.

The conclusion is taht there is not enough evidence to support the claim that the percentage is lower in this district.

Step-by-step explanation:

The conditions for use of the normal model to represent the distribution of sample proportion are not met, as the affirmative responses are less than 10.

np=80*0.1=8

If the test of hypothesis is done as if the conditiones were met, we know that the claim is that  the percentage is lower in this district.

Then, the null and alternative hypothesis are:

H_0: \pi=0.173\\\\H_a:\pi

The significance level is 0.05.

The sample has a size n=80.

The sample proportion is p=0.1.

 

The standard error of the proportion is:

\sigma_p=\sqrt{\dfrac{\pi(1-\pi)}{n}}=\sqrt{\dfrac{0.173*0.827}{80}}\\\\\\ \sigma_p=\sqrt{0.001788}=0.042

Then, we can calculate the z-statistic as:

z=\dfrac{p-\pi+0.5/n}{\sigma_p}=\dfrac{0.1-0.173+0.5/80}{0.042}=\dfrac{-0.067}{0.042}=-1.578

This test is a left-tailed test, so the P-value for this test is calculated as:

P-value=P(z

As the P-value (0.057) is greater than the significance level (0.05), the effect is  not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that  the percentage is lower in this district.

7 0
3 years ago
2. Trouvaughn bought b bags of oranges, which cost 80 cents per bag. If Trouvaughn paid with a
Damm [24]
Amount that trouvaughn paid : $0.80b
ten dollar bill = $10

so $(10-0.80b)
5 0
3 years ago
86.40-12.59 plz answer
Evgen [1.6K]
The answer is 73.81 :))
8 0
3 years ago
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