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trombonebookworm
The height of the jet in miles is 10 miles. There are 5280 feet in a mile, so you would divide 52800 by 5280 and get 10 miles.
10 miles is your answer because
1mile is 5280 feet 
1:5280=x:52800
5280x=52800
x=52800/5280
x=10 

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