Simplify the Rational Expression $$\mathrm { d } = 1.22 \mathrm { x } ^ { 1 / 2 }$$

Simplify the rational expression. Use factoring, and assume all variable expressions represent positive real numbers.
-A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is $$\mathrm { d } = 1.22 \mathrm { x } ^ { 1 / 2 }$$ , where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 20,000 feet? Round your answer to the nearest tenth mile, if necessary.

A) 172.5 mi
B) 12,200 mi
C) 156.2 mi
D) 1220 mi

Correct Answer:

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