Calculate the flux of F across G. 13) F(x, y, z) = 2xi + 2yj + 2zk; G is the surface of the sphere x2 + y2 + z2 = 4 in the first octant Use Stokes's Theorem to calculate (curl F) . n ds . 14) F = -2x2yi + 2xy2j + 2 k; S is the portion of the paraboloid 2 - x2 - y2 = z that lies above the x-y plane