This one really makes me scratch my head; it doesn't help that my textbook omits any details relating to triple integrals, claiming "use details from double integrals". Talk about being cheated.

Let $\displaystyle G$ be the region in $\displaystyle R^3$ bounded by $\displaystyle z=x^2,\ z=y^2$, and $\displaystyle z=4$. Evaluate the integral:

$\displaystyle \iiint_G |x|dV$

I don't know how this one is supposed to work, so I'll need help.