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box with rectangular base to be constucted material cost $4 /in^2 for the side & $5/in^2...

box with rectangular base to be constucted

material cost $4 /in^2 for the side & $5/in^2 for top and bottom.

if box is to have 90in^3 and the length of its base is 2X width, what are dimensions of box that would minimize cost of construction?

Math   Calculus   
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