Find slope of y=-2x+1

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.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?