How do you do this plz help it on a test It will determine if i’m valedictorian

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.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Pranza plotted point a in the coordinate plane below.