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A fence is to be built to enclose a rectangular area of 250 square feet. The fence along three sides is to be made

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A fence is to be built to enclose a rectangular area of 250 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 12 dollars per foot. Find the length L and width W (with WL) of the enclosure that is most economical to construct. L=

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