HELP PLS ILL GET FINES AND HELD BACK AND IM POR

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.

Can someone me with my math problem pls my teacher is on my back about this

Find the solution on the interval [0, 2pi)