One is two times the other. In that interval all values of f(y) are positive. Therefore. . .
Q: Set up, but do not evaluate an integral for the volume of the solid obtained by rotating the region bounded by the parabolas and about and about
So intersection points are
From here on I'm stuck, I'm having difficulty drawing out the graphs and determining which one is outside the other. Err at least if that's even the best approach to take? >.<