i need this for homework. pleasee help

Question

A hair salon charges a fixed rate of $25.00 for a haircut and then an additional $15 for any other services. Write a function to model the cost of services there and then determine how many services you had if you were charged $115

Answer 1

Let x be the number of additional services.

25 + 15x = 115

15x = 90

x = 90/15 = 6

There were 6 additional services.