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

question 465

Multiple Choice

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 30,000 feet? Round your answer to the nearest tenth mile, if necessary.

• A) 191.3 mi
• B) 211.3 mi
• C) 18,300 mi
• D) 1830 mi

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