4. Find the work done by a particle travelling along the path C in the vector eld E: F = (x + y + 1, 2y :1: 4) and C is the triangle with vertices (0, 0), (0, 3), (3, 2) traversed in the counterclockwise direction. (6 points) Include a picture of the oriented curve C. (We have to use line integrals to answer this question.)