[4) Let C be the closed curve starting at {(1, {))I going from there to (3, 9) along y = 5:2, then from (3, 9) along a straight line to (0,9), and then along the y axis from (019) back to (0,0). Use Green's theorem to nd [0 (eta + 2y) are; + (5:1: sin (32)) gay (5) Consider the following vector eld F (3.1;, 2:) z yous (as) 11 2:11:03 [y)j + 3111(2)]; (3] Find the curl of F. (b) Is F a conservative vector eld? How do you know