The profile of the cables on a suspension bridge may be modeled by a parabola. The central span of the bridge is 1220 m long and 138 m high. The parabola y = 0.00037x? gives a good fit to the shape of the cables, where |x| s610, and x and y are measured in meters. Approximate the length of the cables that stretch between the tops of the two towers. 138 m 1220 m The length of the cables is approximately meters.

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