Consider the matrix A 1 3 4 2 1 1 (a) (5 points) Find the cofactors of A, put them into the cofactor matrix C. (b) (2 points) Use A and C to compute det A. (c) (1 points) Use parts (a) and (b) to compute A-. (d) (2 points) Suppose that the 3 in A is changed to 30. Which of C, det A, and A-1 would change? Justify your answer.