appreciate it for your help. All detail please

2. Find the mass of the solid bounded by the xy-plane, yz-plane, xz-plane, and the plane 4x + 3}? + z = 12 _, if the density of the solid is given by 8M, y, z) = x2 . The insulation surrounding a pipe is the region between two cylinders of length L and with the same axis. The inner cylinder has a radius ofR (which is the outer radius of the DJ pipe) and the insulation has a thickness, 1. Give a triple integral (including limits of integration) that give the volume of the insulation and evaluate the integral