Temperature:above and blow 0 degrees

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.

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.