The profile of the cables on a suspension bridge may be modeled by a parabola. the central span of the bridge is 1240 m long and 135 m high. the parabola y equals 0.00035 x squared gives a good fit to the shape of the cables, where startabsolutevalue x endabsolutevalue less than or equals 620 , and x and y are measured in meters. approximate the length of the cables that stretch between the tops of the two towers.