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A rectangular field with one side along a river is to be fenced. Suppose that no...

A rectangular field with one side along a river is to be fenced. Suppose that no fence is needed along the river, the fence on the side opposite the river costs $40 per foot, and the fence on the other sides costs $10 per foot. If the field must contain 72,200 square feet, what dimensions will minimize costs?

side parallel to the river     ft
each of the other sides     ft
Math   Calculus   
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