Can you help me with writing a functions formula

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.

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.