2+4x-upon3 -7=1
what is the answer​

Can someone explain the elimination method to me for this problem?

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.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .