Add:- 2a-3b+3c-4d,3a-b-2c+2d
With complete solution.

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.

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.