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

Call the function c(s) (dollars) where s is the number of other services, then:

c(s)=25+15s. c(s) is the cost in dollars.

If c(s)=$115, then 25+15s=115, 15s=115-25=90, s=90/15=6, so the number of services is 6.