A lamina occupies the part of the disk x + y 9 in the first quadrant and the density at each point is given by the function p(x, y) = 4(x + y). A. What is the total mass? 81pi/2 B. What is the moment about the y-axis, My = ffxp(x, y)dxdy? C. What is the moment about the x-axis, Mx = ffyp(x, y)dxdy? D. Where is the center of mass? ( 1.527887 E. What is the moment of inertia about the origin, (x + y)p(x, y)dxdy?