Thomas has $25 total in his wallet. he has only $10 and $5 bills. if he has three times as many $5 bills as $10 bills, how many $5 bills does he have?

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.