Final answer:
Angela earned $304 and Kelly earned $570 last week.
Step-by-step explanation:
To find the amount of money Angela and Kelly earned last week, we start by calculating Angela's earnings. Angela earns $8 for every hour she works, and since she worked 38 hours, her total earnings can be calculated as:
Earnings = $8/hour × 38 hours = $304
Now, to calculate Kelly's earnings, we use the function f(x) = 15t, where t represents the hours worked. Since Kelly also worked 38 hours, her earnings can be calculated as:
Earnings = 15 × 38 = $570
Therefore, Angela earned $304 and Kelly earned $570 last week.