Final answer:
Serena ran a total of 12 miles in the run-a-thon, calculated by dividing the total amount raised, $42, by the amount raised per mile, $3.5.
Step-by-step explanation:
Serena raised $42 participating in a run-a-thon by raising $3.5 for every mile she ran. To calculate how many miles she ran, you divide the total amount of money raised by the amount raised per mile. So, you divide $42 by $3.5 per mile.
- $42 ÷ $3.5 per mile = 12 miles
Therefore, Serena ran 12 miles during the run-a-thon.
To find out how many miles Serena ran, we can divide the amount of money she raised by the amount of money she raised per mile. So, $42 / $3.5 = 12 miles. Therefore, Serena ran 12 miles in the run-a-thon.