5. Use Stokes' theorem to evaluate: a). (-2y d.x + 3x dy + 10z dz), Jo where C is the circle (x - 1)2 + (y - 3)2 = 25, z = 3. b). 'Spu . (1 X A S for F = 6yzi + 5x j + yzer k, where the upwardly oriented surface S is 1 the portion of the paraboloid z = =x2 + y' for 0