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 64 m above the surface of Earth can see 12 km to the horizon, how far can a person see to the horizon from a point 36 m above the surface? The person 36 m above the surface can see km to the horizon. (Simplify your answer.)

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.