Solve for x.
3 ^ (7x) = 81 ^ (x + 9)

the unit i'm on is over logarithmic functions. having a hard time with it : /

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.