Each side of a suspension bridge has a cable that is secured at either end of the span by two supporting towers. The cable is attached to the tops of the two towers. In the section between the two towers, the cable forms a parabolic curve. At its lowest point, the cable is 40 feet above the surface of the bridge. The towers are 450 feet apart, and the vertical distance from the surface of the bridge to the top of each tower is 500 feet. Use the left tower as the y-axis. Hint y=a(x-h)2+ k
