#### 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 $\pi(f(x)^2-g(x)^2)$.

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

(b) is the right answer.

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