Calculus 3

help pls, will upvote 2. (25pts) Evaluate the following line integrals. (a) (8pts) Evaluate Jo eldr and Joy'ds, where C consists of the arc of r + 3 = 0 from (-1, 1) to (1, -1), followed by the line segment from (1, -1) to (0,0). (b) (8pts) Find the mass of the cable in the shape of the curve C, where C is given by ~ +y? = 1, x > 0 and y > 0 if the density at any point (z, y) is ay. (c) (9pts) Let F(x, y, z) = zi - rk be a vector field. Evaluate f, F . dr, where C the intersection curve of the surfaces y = a? and 2 + x = 12 with 0