FIND THE HCF OF = x2-y2, x2+xy ans x2+2xy+y2

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.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b