Answer:
Let s stand for the number of shirts Jackson can purchase.
10.50 s + 7.50 ≤ 144
He can purchase no more than 13 shirts.
Explanation:
Each shirt costs $10.50, plus an overall $7.50 shipping cost, and he can spend no more than $144 dollars. This means that it is a less than or equal to inequality.
To solve:
10.50 s +7.50 ≤ 144
10.50 s ≤ 144-7.50
10.50 s ≤ 136.50
s ≤ 136.50/10.50
s ≤ 13
This means that he can purchase no more than 13 shirts.