Hi - Here's the entire problem to avoid confusion >< "A kite is flying at a height of 500 ft and at a horizontal distance of 100 ft from the stringholder on the ground. The kite string weighs 1/16 oz/ft and is hanging in the shape of the parabola y=(x^2)/20 that joins the stringholder at (0,0) to the kite at (100,500). Calculate the work (in foot pounds) done in lifting the kite string from the ground to its present position." I've been messing with arc length of the parabola because I think there might be a way to solve it with that, but I really don't know... Can someone give me a hint??