A farmer wants to build a closed cylindrical reservoir with a capacity of 11,000 cubic feet. The farmer has decided to use two different materials: one for the top, and the other for the bottom and sides. The cost of the first material (used for the top) is $3 per square foot; the cost for the second material is $5 used for the sides and bottom. The farmer wants you to express the cost of constructing the reservoir in terms of its radius.

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Lef R Raclius of cylindrical reservoir L length of reservoir ... View the full answer