I am having trouble with these triple integrals. I understand them when it already tells me what to integrate from...but I have trouble figuring it out with just the given bounded area. Here is one of the ones I am stuck on.

∫∫∫ xdV, where D is bounded by the paraboloid z=x^+y^2, and the plane z=1

I really have no clue how to set it up.