5280 feet = 1 mile so 21120 feet = 21120/5280 = 4 miles.
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9 mi = 47,520 ft
1.2 mi = 6,336 ft
79,200 ft Algebraic Steps / Dimensional Analysis Formula 15 mi*5280 ft 1 mi=79,200 ft
4.5 mi Algebraic Steps / Dimensional Analysis23,760 ft*1 mi 5280 ft=4.5 mi
32,736 ft or 33 x 10^3 ft