Homework assignments:
 All assignments from now on are made through MyMathLab and graded with the score going towards 10% of the course grade.
 [solve by 9/26] 12.7: 1, 7, 11, 19, 23; 12.8: 1, 3, 7, 15, 19, 41; 12.9: 1, 9, 15.
 [solve by 9/19] 12.4: 1, 7, 9, 23, 25, 27; 12.5: 1, 5, 9, 17, 25; 12.6: 1, 5, 9, 17, 25.
 [solve by 9/12] 12.1: 1, 5, 11, 19, 21; 12.2: 1, 5, 7, 13, 19, 25; 12.3: 1, 5, 11, 15, 19.
 [solve by 9/5] 9.3: 25, 31; 11.5: 1, 15, 17; 11.6: 9, 17; 11.7: 1, 7, 17, 21, 39.
 [solve by 8/29] Section 8.7: 3, 15; 9.1: 1, 15, 17, 23, 25, 31;
9.2: 1, 15, 23;
9.3: 3, 5, 21;
9.Review: 32,33,34. All problems are from SHE (Salas, Hille, Etgen) book.
