Question 4 (20 points) Given a vector field F " Mi + Nj. where Maxy, and No x - yl, find the work done by this vector field over the closed curve C,which is bounded by the triangle shown below, using each of the following two methods: () using the line integral $. F - dr = 2x (0.0) (10) (by using Green's Theorem ( 1, 2 ) Note: More space is iven on the next page Ci b