21. Find the volume of the solid generated by revolving the region bounded by the graphs of
the equations about the line $x = 2$.
$y = 2x^2$, $y = 0$, $x = 2$
22. Find the arc length of the graph of the function over the indicated interval.
$y = \frac{3}{2}x^{2/3} + 4$, $[1, 27]$
23. Find a set of parametric equations for the rectangular equation that satisfies the given condition.
$y = 4x + 1$, $t = -1$ at the point $(-2, -7)$
24. Find $\frac{dy}{dx}$ and find the slope at $\theta = -\frac{\pi}{3}$
$x = 2 + sec\theta$, $y = 1 + 2 tan\theta$
25. Find the area of the surface generated by revolving the polar equation over
the given interval about the line $\theta = \frac{\pi}{2}$
$r = a cos\theta$, $0 \le \theta \le \frac{\pi}{2}$
