Ok, here are a couple of the other problems i need help with:
A cylindrical hole is drilled through the center of a sphere of radius R. Use the method of cylindrical shells to find the volume of the remaining solid, given that the solid is 6 cm high.
Find the volume of the solid generated by revolving about the line x=-1, the region bounded by the curves y=-x^2 +4x -3 and y=0
Actually, I think it is enough information on the hole-drilling problem. We know the radius of the sphere, and we know that the drilled hole went through the center. You can orient the object any way you want. I'd probably put the center of the sphere at the origin, and orient the hole to be on the -axis. Then you use the shell method as described. I suppose you don't technically know that cm, but you could infer that through the use of the "through" language.