Can you show me how to the the check from numbers 1 2 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.

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

What is always true when two whole numbers are subtracted?