7. Evaluate the surface integral of each scalar function over the sphere of radius 2 centered at the origin. (a) p(x, y, z) = 3x + 4y? - 2 (b) q(x, y, 2) = 12y - 2yz3 + zx (Hint: Use the divergence theorem by finding a vector field F such that F.n is equal to the given function on the sphere, where ni denotes the normal vector field)