If g(s) is the inverse of s(g) , and g(2) =16 then s(16) = 2 true or false?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Just tell me how to set up the equation.