HELP ME PLEASE IM BEGGING

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.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Which of the following parabolas opens up?