Help algebra have n

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.

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Why is studying fractions important