PLZ HELP, I need it done in like 20 mins. PLZZZ

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.

If i have 20$ and i gave 5$ away how much i got

Write the expression as a single natural logarithm. 2 in a - 4 in y