Evaluate - xy dx + (x + y)dy along the curve y = 2x from ( - 3, 18) to ( - 2,8). O xy dx + (x + y)dy = C (Type an integer or a simplified fraction.)Evaluate is for the F . Tds for the vector field F = x i - yj along the curve x = y~ from (1,1) to (4, - 2). C F . Tds = (Type an integer or a simplified fraction.) CFind the work done by the force F = xyi + (y - x)j over the straight line from (1,3) to (2,6). The amount of work done is (Type an integer or a simplified fraction.)F = - 4xyi + 4yj + 5k is the velocitiy field of a fluid flowing through a region in space. Find the flow along the given curve r(t) = ti + t'j + k, Ost=5 in the direction of increasing t. The flow is (Type a simplified fraction.)