The main cables of a suspension bridge typically hang in the shape of parallel parabolas on both sides of the roadway. The vertical support cables, labeled a-k, are equally spaced, and the center of the parabolic cable touches the roadway at f. If this bridge has a span of 160 ft between towers, and the towers reach a height of 75 ft above the road, what is the length of each support cable, a-k? What is the total length of vertical support cable needed for the portion of the bridge between the two towers?