Answer:

Explanation:
The following information was missing from the question:
Number of lawns mowed by Brett each week = 3
Using this, we may solve the question as:
We are given the following information in the question:
Money earned by Brett for each lawn he mows = $15
Number of lawns mowed by Brett each week = 3
Number of weeks Bret work = w weeks
We have to find the expression for the amount of money Bret has earned after w weeks.
Total money =

Thus, the expression for money earned is given by:
