Concept explainers
Material Needed to Make a Drum A steel drum in the shape of a right circular cylinder is required to have a volume of 100 cubic feet.
(a) Express the amount of material required to make the drum as a function of the radius of the cylinder.
(b) How much material is required if the drum's radius is 3 feet?
(c) How much material is required if the drum’s radius is 4 feet?
(d) How much material is required if the drum’s radius is 5 feet?
(e) Graph . For what value of is smallest?
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