36. Let I = = (x 3y + 1) dx + (ye* + y) dy, where C is the trapezoid in the xy-plane with vertices (0,0), (2,0), (2,1), and (1,1) oriented 1 counter-clockwise. Find the value of I. 34. Let S be the part of the surface z = 1 - x that lies above the xy-plane and between the planes y = 0 and y + 2z = 4. Find the mass of S if its mass density is given by 8(x, y, z) = 5/5x + z.