Each cable of the Golden Gate Bridge is suspended (in the shape of a parabola) between two towers that are 640 miles apart. The top of each tower is 75 meters above the roadway. The cables touch the roadway at the midpoint of the two towers m. Write an equation that models the cables of the bridge.
***NOTE*** This is a Quadratic Word Problem, so please use the Quadratic Method. 20 extra BRAINLIST will be rewarded if all work is step by step and shown CORRECTLY!!