4. a Find the work done the force F = 3xyi - y'j moves a particle along the curve C: y=2xfrom (0,0) to (1,2) in the xy-plane. b Evaluate ff.dr Where = (2xy + z)i+ x + 3xzk along the straight line C joining (1,- 2,1) and (3,2,4) 5. a Evaluate finds Where f= (x + y)-2x +2yzk and S is the surface of the 2x+y+ 2z= 6 in the first octant.