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A fence is to be built to enclose a rectangular area of 280 square feet. The...

A fence is to be built to enclose a rectangular area of 280 square feet. The fence along three sides is to be made of material that costs 5 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the length LL and width WW (with W≤LW≤L) of the enclosure that is most economical to construct.

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