Which of the following expressions represents the radius of a typical washer formed…

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

Problem

Which of the following expressions represents the radius of a typical washer formed when the region bounded by

y = \sqrt{x}

and the

x

-axis is revolved about the

x

-axis for

0 \le x \le 9

? (a)

R(x)=x

(b)

R(x)=9-\sqrt{x}

(c)

R(x)=\sqrt{x}

(d)

R(x)=3