Question 1 25 pts 4 1 5 Let A = 2 6 4 . 5 9 3 Let B = A'l. What is the value of bu? If B does not exist, enter 99999 as your answer. Question 2 25 pts 6 7 8 3 1 Let B = A'l. What is the value of 1:22? If B does not exist, enter 99999 as your answer. Question 3 25 pts Only square matrices are invertible. O True O False Question 4 25 pts 1 2 Given the matrix A = , what value of k would make A singular? 2 k