#4 Evaluate the line integral integral subscript C open parentheses x plus 2 y close parentheses d x plus x squared d y a) on the line with parametric equations x equals t and y equals 1 half t from (0,0) to (2,1) b) on the line with parametric equations x equals t and y equals minus t plus 3 from (2,1) to (3,0) c) on the line with parametric equations x equals t and y equals 0 from (3,0) to (0,0) d) Find the total work around the path