Question: The arch of a small bridge across a stream is parabolic. If, at water level, the span of the arch is 80 ft and the

The arch of a small bridge across a stream is parabolic. If, at water level, the span of the arch is 80 ft and the maximum height above water level is 20 ft, what is the equation that represents the arch? Choose the most convenient point for the origin of the coordinate system.

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