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Zielflug [23.3K]

2 years ago

11

The area of a rectangular wall of a barn is 140 square feet. Its length is 6 feet longer than twice its width. Find the length a

nd width of the wall of the barn.

1 answer:

timofeeve [1]2 years ago

7 0

$l*w=140$
$l=2w+6)$
$(2w+6)*w=2w ^{2} +6w=140$
$70=w^2+3w$
$70=w(w+3)$
w=7
$l=2(7)+6$
$l=20$

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Step-by-step explanation:

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Step-by-step explanation:

Complete question

A factory that manufactures screws is performing a quality control experiment. Each object should have a length of no more than 14 centimeters. The factory believes that the length of the screws exceeds this value and measures the length of screws. The sample mean screw length was centimeters. The population standard deviation is known to be centimeters.

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2. What is the alternative hypothesis?

Solution :

The null hypothesis is basically the problem statement that needs to be tested.

Alternate hypothesis is opposite of that of null hypothesis

a) Null Hypothesis: length of each screw is less than 14 centimeters

b) Alternate Hypothesis: length of each screw is equal to or greater than 14 centimeters

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Step-by-step explanation:

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