. (9 points) Question 12 : Find A-, using "super-augmneted ma- trix" if 3 0 A = 2 7 then check your answer. . Solution : 12. (8 points) Question 8 : Find span of A1, A2, and A3 given that (use elementary row operations) . Solution : 8o (9 points) Question 9 : Find conditions on a, b, c, and c such that A commutes B if 0 Solution : \fo (9 points) Question 11 : Find A'l, using the determinant, if 4 3 9 7 A: _l l 8 10 then check your answer. Note : DON'T convert fractions to decimals. 0 Solution : 11 . (8 points) Question 7 : Are the following matrices linearly indepen dent (use elementary row operations)?? Al = 1 2 2 42 = 1 1 ] and A3 - ) ;] . Solution