Help plz and please make sure it’s right :)

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.

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Use sigma notation to represent the following series for 9 terms.