Hey guys I really need help on this one!

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.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Write the function for the graph. (1.8) (0,4)