a hardware store owner chooses to enclose an 800 square foot rectangular area in front of her store so that one of the sides of the store will be used as one of the four sides of the fence. if the two sides that come out from the store front cost $3 per running foot and the side parallel to the store from costs $5 per running foot for materials, then find the dimensions of the fence that will minimize the cost of the fence.
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The coordinate of all relative maxima 2x^4+x^3-33x^2-16x+16
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