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Mathematics 7 Online
OpenStudy (anonymous):

A farmer is planning a rectangular area for her chickens. The area of the rectangle will be 800 feet. Three sides of the rectangle will be formed by fencing, which costs $5 per foot. The fourth side of the rectangle will be formed by a portion of the barn wall, which requires no fencing. In order to minimze the cost of the fencing, how long should the fourth side be? A.40ft B.20ft C.16ft D.50ft

OpenStudy (ahsome):

This is quadratics, isn't it?

OpenStudy (anonymous):

Yes

OpenStudy (anonymous):

Well its geometry so I guess that fits right in there

OpenStudy (ahsome):

Thought so. Let two of the sides be \(x\) and the third side \(y\)

OpenStudy (anonymous):

so x^2-y ?

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