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Ket [755]
3 years ago
14

the area of a rectangle is 99ft^2,and the L is 7ft more than twice the width. find the dimension of the rectangle.

Mathematics
1 answer:
givi [52]3 years ago
3 0
A = L * W
A = 99
L = 2W + 7

99 = W(2W + 7)
99 = 2W^2 + 7W
-2W^2 - 7W + 99 = 0
(-2W + 11)(W + 9) = 0

-2W + 11 = 0
-2W = -11
W = -11/-2
W = 5.5

W + 9 = 0
W = -9 .....not this one because it is negative

so the width (W) = 5.5ft <====
L = 2W + 7 .....2(5.5) + 7 = 18 ft is the length (L) <==
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A 99% confidence interval for the difference between two proportions was estimated at 0.11, 0.39. Based on this, we can conclude
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Answer:

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Step-by-step explanation:

Let p1 and p2 the population proportions of interest and let \hat p_1 and \hat p_2 the estimators for the proportions we know that the confidence interval for the difference of proportions is given by this formula:

\hat p_1 -\hat p_2 \pm z_{\alpha/2} SE

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3 years ago
The mass of a bacteria culture doubles every four days. If the initial sample is 5mg: a) how much will you have after one week (
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Answer:

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Formula for exponential growth is given as:

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