Please tell me what x is 3(x+6)=48

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.

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?