[10 pts.] 1 - 1 UT 1 1 11 TO If A = 2 2 , B = 2 2 -3 , and C = 2 0 4 , then show that the matrix 0 2 3 2 -3 0 1 W addition is associative. i.e., A + (B + C) = (A + B)+ C