Find the total mass M and the center of mass of the solid with mass density o(x, y, z) = kxy (1 - z) g/cm , where k = 7 x 10, that occupies the region bounded by the planes x = 0, y = 0, z = 0, z = 1, and x + y = 1. M = 350000 g X ( x, y, z) = 4 2 7 35' 70' 56 X