(7 marks) (b) Evaluate each of the following line integrals: (i) [xds, where C is the portion of the curve x = 2t, y = f and z = -t between (2;1,-1) and (4,4,-2). . (4 marks) (1i) [Foder, where F = xy itz j ty- k, dr = dx it dy j + dz k and C is the directed straight line segment from (0, 0, 0) to (1; 1, 1)