4. Evaluate [[(2x + 3y)i + (3x + 2y)j + 3z k] . dr where C is the line segment from (2, -1, 3) to (4, 2, -1). 5. Let C be the curve of intersection of the plane x + y + 2z = 1 and the cylinder x2 + y2 = 1. Calculate [ F . dr, where F = xi + yj + zk