Solve the problem.A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is 
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 21,000 feet? Round your answer to the nearest tenth mile, if necessary.
A. 1281 miles
B. 160.1 miles
C. 12,810 miles
D. 176.8 miles
Answer: D
Mathematics
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