Complete the following questions before our next class (you can skip some of these, but only if you are absolutely certain you can get the correct answer with no difficulty).
Exercise 12J questions 1abc, 2, 3a, 7a, 8ab, 9acd, 11, 14a
Exercise 12K questions 2, 4b, 5a, 8a, 9
Exercise 12L questions 3, 4, 5ab, 8a, 11, 12, 17, 20, 21