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Single Variable Calculus

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Moderate

Minimize Length of Fence Needed

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A farmer wishes to fence in a rectangular pasture next to a straight river. If the area is to be $800$ ft$^2$ and the river acts as a natural fence, what is the minimum length of fencing possible?

A

$80$ ft

B

$120$ ft

C

$60$ ft

D

$84.85$ ft