Factor: 5x(2-x)+4x(2x-5)-(3x-4)

7x+8y=-18, 4x-9y=-3 solve the system of equations

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.

Are the corresponding angles congruent? explain why or why not.