Answer:
M = 3 + 5n
Explanation:
In this scenario, we have one fixed value which is the initial 3 lawns that he mowed on his first day. After that, he mowed 5 lawns but we are not given the number of days therefore this will be represented by the variable n. Using this information we can create the following model.
M = 3 + 5n
As mentioned above, the variable n represents the number of days that Carmelo has worked mowing lawns while the variable M represents the total number of lawns that Carmelo mowed.