Question: please solve quickly Afence is to be built to enclose a rectangular area of 800 square feet. The fence along three sides is to be

please solve quickly

Afence is to be built to enclose a rectangular area of 800 square feet. The fence along three sides is to be made of material that costs $3 per foot. The material for the fourth side costs $9 per foot. Find the dimensions of the rectangle that will allow for the most economical fence to be built. The short side is D ft and the long side is D ft

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