The feet of a commemorative parabolic steel arch 100 m high are 200 m apart. determine whether the focus of the arch is above / below ground, and how many feet it lies above or below the ground. my guess:

The feet of a commemorative parabolic steel arch 100 m high are 200 m apart. determine whether the focus of the arch is above / below ground, and how many feet it lies above or below the ground.

my guess: 25 ft above ground

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