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9-10.

Use the washer method to calculate the volume of the solid generated by revolving the region bounded by $y = x^2$ and $y =\sqrt { x }$ about the $x$-axis. Homework Help ✎

Start by determining the points of intersection. The $x$-values of the points of intersection will be the bounds of your integral (this is rotation about the $x$-axis, so the width of the washers is $dx$).

The general formula for the washer method is:

$V=\int_{a}^{b}\pi(R^2-r^2)dx$

Which function is the outer radius $R$ and which function is the inner radius $r$?