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Here is a link to the question:Calculus help! Word problem?

A rectangular field is to be enclosed on four sides with a fence. Fencing costs $3 per foot for two opposite sides, and $8 per foot for the other two sides. Find the dimensions of the field of area 770 ft squared that would be the cheapest to enclose.

Calculus help! Word problem? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.