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I have posted a link there to this topic so the OP can see my work.Pre-calculus, parabola problem?

A cable of a suspension bridge is attached to two pillars of height 55 m and has the shape of a parabola whose span is 40 m. the roadway is 5 m below the lowest point of the cable. If an extra support is to be placed where the cable is 30 m above the ground level, find the distance from the nearest pillar where the support is to be placed.