How do i solve for an inverse for example:

f(x)=1/3x+12

Ihave trouble finding the nth term of a linear sequence

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.

15 liters is approximately how many gallons