The region bounded by and for is revolved about the -axis

MATHEMATICS · Single correct · AP · Calculus AB · Applications of Integration · Applications of Integration

Problem

The region bounded by

y=2x

and

y=x^2

for

1\le x\le 2

is revolved about the

x

-axis. Which expression represents the inner radius

r(x)

of a typical washer at position

x

in this interval? (a)

2x-x^2

(b)

x

(c)

x^2

(d)

2x