Un asked six friends how many different foreign countries they'd been to. He recorded 0, 1, 1, 2,
5, and 9 countries visited
What is the mean absolute deviation of countries visited?
Round to the nearest tenth, if needed.
A. 0
B. 2.7
C. 2.9
D. 3

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.