Answer:
9h
Explanation:
If he makes $9 an hour, and h represents how many hours he worked, the amount of money he made can be represented by 9h.
This will multiply $9 by how many hours he worked, giving us the total amount he made.
For example, if he works 2 hours, he will get $18.
So, the expression that represents how much he made yesterday is 9h.