Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus \$30$30dollar sign, 30 for each hour of work. his total fee for a 444-hour job, for instance, is \$170$170dollar sign, 170. jabari's total fee, fff, for a single job is a function of the number, ttt, of hours it takes him to complete the job. write the function's formula.