I need help with my Khan Acadmey work I don’t Understand any of it. Can someone help me Please

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.

Type the correct answer in each box. use numerals instead of words. if necessary, use / fir the fraction bar(s). the graph represents the piecewise function: h

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog