Given that 13 base x=12 base x, find the value of x

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Factor this polynomial completely. x^2-8x+12