Answer:
c) $615
Explanation:
The expression used to determine how much is the charge for the customer after the job is

where
h is the number of hours the job took
c is the number of cans of paint used during the job
In this problem:
c = 3 (the painter used 3 cans of paint)
h = 15 (the painter took 15 hours for the job)
So substituting these values into the equation for p, we find the total value that the painter charged for the job:

So, the correct answer is
c) $615