A suspension bridge has two supporting towers with a cable secured at either end of the span and then draped off the towers. In the section between the two towers, the cable forms a parabolic curve. At the lowest point of the curve the cable is 20 feet from the surface of the bridge. The supporting towers are 474 feet apart, and rise 411 feet from the surface of the bridge to the top of the tower. Use the height of the left tower as the y-intercept

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