2.15.6, Triple Integrals in Rectangular Coordinates:
a) Sketch the region bounded by the surfaces z=x^2+y^2, x=0, y=0, z=0, x+y=1. Each pair of the surfaces intersects in a curve. Be sure to include these curves in your sketch. Then use a triple integral to calculate the volume of the solid.
b) Find the volume of the region in the first octant bounded by the coordinate planes, the plane x+z=2, and the parabolic cylinder y=9-x.