<PRE><B>Question 1098435</B>
The formula for the surface area of a cylinder is S = 2(pi)r^2 + 2(pi)rh. The surface area of a cylinder is 112pi square inches and the radius is 4 inches. What is the height of the cylinder?
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S = 2pi*r^2 + 2pi*r*h
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Putting parentheses around pi is a waste of time.

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S = 2pi*r^2 + 2pi*r*h = 112pi
r = 4
Sub 4 for r, solve for h

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