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Sauron [17]
3 years ago
11

ASAP plizzzz I need help it's soooooo confusing

Mathematics
1 answer:
saul85 [17]3 years ago
6 0
Which one question did you want us to answer? all?
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A fence is to be built to enclose a rectangular area of 1800 square feet. The fence along three sides is to be made of material
drek231 [11]

Answer:

length = 60 foot, width = 30 foot

Step-by-step explanation:

Area of rectangular part, A = 1800 ft²

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Let the length of the rectangle is l and the width of the rectangle is W.

Area = Length x width

A = L x W

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Total cost of fencing, C = 6 x ( L + W + L) + 18 x W

C = 6 (2L + W) + 18 W

C = 12 L + 24 W

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C=12L+\frac{43200}{L}

Differentiate both sides with respect to L:

\frac{dC}{dL}=12-\frac{43200}{L^{2}}

Put it equal to zero for maxima and minima

12-\frac{43200}{L^{2}}=0

L = 60 foot

and W = 30 foot

So, the costing is minimum for length = 60 foot and the width = 30 foot.

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3 years ago
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where is the question??

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What’s the equation of a trapezoid
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