Please answer asap! (im timed)

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.

Find the value of x for which line a is parallel to line b

Y+ 2/y is it a polynomial in one variable or not? and if so, why?