Math

A toolshed with a square base and a flat roof is to have a volume of 800 cubic feet. If the floor costs $6 per square foot, the roof $2 per square foot, and the sides $5 per square foot, determine the dimensions of the least expensive shed.

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  1. x^2y = 800
    y = 800/x^2

    c = 6*x^2 + 2*x^2 + 5*4*xy
    = 8x^2 + 1600/x
    dc/dx = 16x - 1600/x^2 = 16(x^3-100)/x^2
    dc/dx=0 at x=∛100

    so, the shed is ∛100 x ∛100 x 8∛100

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