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A rancher plans to construct a rectangular pen for a cow with an area of 20...

A rancher plans to construct a rectangular pen for a cow with an area of 20 square feet.
Three sides of the pen will be constructed from fencing that costs $20 per foot of length and the
remaining side will be a stone wall that costs $52 per foot of length. Find the minimum cost to build
this pen.

Math   Calculus   
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