15% = 0.15
15% of 71.85 is equal 0.15*71.85 ≈ 10.78
How many 5's are there? There are 4. So that means the answer is 5^2...Which is C on your answer choices.
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It take 23 mins for the drive
He needs to reach the airport by a quarter before 6
a quarter before 6 = 5.45
So he needs to leave 23 mins before 5.45
23 mins before 5.45 = 5.22