Pls help me with this, no jokes or links please​

Which value of c would make he following expression completely factored? 8x+cy

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.

Which of the following is true for the relation f(x)=2x^2+1