Question: A fence is to be built to enclose a rectangular area of 320 square feet. The fence along three sides is to be made of

A fence is to be built to enclose a rectangular area of 320 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 dimensions of the enclosure that is most economical to construct.

a) What are the dimensions of the enclosure that is most economical? (List the smaller dimension first.)

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