I’m building a box with an open top. The base will be made of wood and the sides will be made of glass. The volume of the box needs to be 720 cubic inches. If glass costs four times as much as wood, use the method of Lagrange multipliers to find the dimensions of the box that minimize the cost of the materials.
Added by Colin G.
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A rectangular tank with open top has its base made of slate and its sides made of glass. The volume of the tank is 540 cubic ft. If slate costs five times as much as glass (per unit area), use the method of lagrange multipliers to find the dimensions of the tank which minimize the cost of the materials.
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