Plz help me ill mark brainliest i promise

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.

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}