A rectangular closed box with square base is to have a capacity of 64 cu. in. We want to determine the least amount of material to dA be used. If we let A be the surface area, x be a side of the base, and y be the height of the box, what is ? dx dA 256 A = 4x - dx x2 dA = 4 + dx 512 B x3 dA 256 2x dx x2 dA 256 = 4x + x2 dx

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