Answer
(b) is the right answer.
Work Step by Step
(b) is the right answer. The cross sections will be washers with outer raduis $f(x)$ and inner radius $g(x)$ and the area will be $\pi(f(x)^2-g(x)^2)$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 6 - Applications of the Integral - 6.3 Volumes of Revolution - Preliminary Questions - Page 304: 4
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