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Respuesta:
To find Maria's total earnings, we use the expression:
\[ \text{Total Earnings} = 15 \times h \]
where \( h \) is the number of hours worked.
**A. If Maria worked 20 hours last week:**
\[ \text{Total Earnings} = 15 \times 20 = 300 \]
So, her total earnings would be $300.
**B. If Maria worked 12 hours last week:**
\[ \text{Total Earnings} = 15 \times 12 = 180 \]
So, her total earnings would be $180.