HEY CAN ANYONE PLS ANSWER DIS MATH QUESTION

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.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Which expression is equivalent to -5(3x - 6/7)