. A closed rectangular box with a volume of 16 ft is made from two kinds of materials. The top and bottom are made of material costing 10 ¢ per square foot and the sides from material costing 5¢ per square foot. Determine the dimensions of the box so that cost of materials is minimized. answer: length and width = 2 feet, height = 4 feet %3D

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A: As per our guideline we are allowed to answer only one question. Kindly repost the other question as...

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A: Here we use  i) derivative formula for u/v which stats that d(u/v)=(v.du-u.dv)/v2