An internet service provider charges $18 per month plus the initial set-up fee. One customer paid a total of $81 after 2 months of service.
A. Write an equation modeling this situation.
B. What is the initial set-up fee?
C. How much does it cost after 5 months of service?

Step-by-step explanation:

36 + x=81

Initial set up fee is $45

135 would be 5 months of service

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)