Final answer:
By multiplying the number of baseball cards collected each month (15) by the number of months (10), it is determined that the student will have 150 baseball cards after 10 months.
Step-by-step explanation:
To calculate how many baseball cards one will have after collecting a certain number each month, you can use a simple multiplication. If a student collects 15 baseball cards every month, to find out how many they will have in 10 months, you multiply the number of cards collected each month by the number of months.
15 cards/month × 10 months = 150 cards
Therefore, the student will have 150 baseball cards after 10 months.