3 years ago

Please help, I would appreciate it a lot

Mathematics

1 answer:

AleksAgata [21]3 years ago

8 0

Answer:

Sry, Can't help.

It's soo hard!!

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The length of a rectangular air filter is 33 inches less than twice the width. find the length and width of the filter if the ar

Karolina [17]

L=2W-33, A=LW, and A=464464 so

464464=(2W-33)W

464464=2W^2-33W

2W^2-33W-464464=0

W=(33(+-)(3716801)^(1/2))/4

W=490.23in (approx)

L=2W-33=947.45in

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3 years ago

A simple random sample of 125 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 335.

Fed [463]

Answer:

$1463.3\:$

Step-by-step explanation:

Since the population standard deviation $\sigma$ , is known, we use the z confidence interval for the mean.

This is given by:

$\bar X-z_{\frac{\alpha}{2} }(\frac{\sigma}{\sqrt{n} } )\:$

For a 95% confidence interval we use $z=1.96$ .

It was also given that: $n=125$ , $\bar X=1522$ and $\sigma=335$

Let us substitute the values to get:

$1522-1.96(\frac{335}{\sqrt{125} } )\:$

$1463.3\:$

<u>Interpretation:</u>

We can say with 95% confidence that the interval between 1463.3 and 1580.7 SAT scores contains the population mean based on the sample 125 SAT scores.

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3 years ago

Given m ||n, find the value of x <br> 167°

frutty [35]

Answer:

Step-by-step explanation:

180-167= 13

× = 13 degrees

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3 years ago

10) If the original price is $76.50 and there is a 30% discount, what is the sale price?

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