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Algebra

The distance that a person can see to the horizon on a clear day from a point above the surface of Earth varies directly as the square root of the height at that point. If a person 196m above the surface of Earth can see 21km to the​ horizon, how far can a person see to the horizon from a point 36m above the​ surface?

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  1. d = k√h, so d/√h is constant
    You want d such that
    d/√36 = 21/√196

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