Please help

What is the inverse of the function f(x)=2x+1

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?