Final answer:
Aaron earned $11 per hour.
Step-by-step explanation:
To find how much Aaron earned per hour, we need to subtract his expenses from his total earnings and then divide by the number of hours he worked.
Expenses = $15
Total earnings per week = $70
Number of hours worked = 5
Earnings per hour = (Total earnings - Expenses) / Number of hours worked = ($70 - $15) / 5 = $11/hour.