Section 7.9. 13, 15, 25, 27; Eds 6 and 8, Section 7.8 13, 15, 25, 27. (29 Nov)
Section 7.9. 1-9 odd; Eds 6 and 9, Section 7.8, 1-9 odd. (27 Nov)
Section 7.7. 1,3,5,7; Eds 6 and 8, Section 7.6 21,23,25,27 (20 Nov)
Section 7.6. 25,27,29: Eds 6 and 8, 33,35,37. (20 Nov)
Section 7.6. 1,3,9,11,15,17 (all editions. (17 Nov)
Section 7.5. 9,11,35 (all editions). (17 Nov)
Section 7.5. 1,3; 15-21 odd (all editions). (15 Nov)
Section 7.4. 7-15 odd; 23, 27, 29 (all editions). (15 Nov)
Section 7.4. 1,3,5 (all editions). (13 Nov)
Section 7.3. 1-17 odd (all editions). (13 Nov)
Section 7.2. 1, 9-19 odd (all editions). (8 Nov)
Section 6.1. 1-21 odd, except for 13 (all Eds). (6 Nov)
Section 4.7. 9, 11, 15 (but for \( t>0\)), 25, 31. Eds 6 and 8: 10, 12, 15, 25, 31. (30 Oct).
Section 4.7. 1,3,5,7,35,41,43. Eds 6 and 8: Replace 2,3,5,7,35,45,47. (27 Oct)
Section 4.6. 1, 3, 9, 11, 15, 23. Eds 6 and 8: 2, 4, 9, 12. And in either case,
Consider the ODE \( ty^{\prime\prime} -(t+1)y^\prime +y=t^2. \) Given \( y_1 = e^t, \, y_2=t+1 \) are solutions of the homogeneous equation, find the general solution for \( t>0.\) (25 Oct)
Section 4.5. 1, 3, 7, 9, 11, 13, 15, 17, 21, 29, 31, 33, 35, 37. Eds 6 and 8: 2, 4, 7, 10, 11, 14, 15, 18, 21, 29, 31, 33, 35, 37. (20 Oct).
Section 4.4. Problems 1-31 odd (minus 11). For the 6th and 8th eds, 1,3,6,8,10, 13-35 odd. (18 Oct)
Section 4.3. Problems 1, 5, 9, 13, 17, 21, 29. For the 6th and 8th eds, 2, 6, 10, 14, 17, 21, 29. (13 Oct)
Section 4.2. Problems 1-19 odd; 27, 29, 31, 37, 39, 41. For the 6th and 8th eds: 2,4,6, 7, 9, 11, 13, 16, 18, 27, 29, 31 , 37, 39, 41. (4 Oct)
Section 2.6. Problems 1-7 odd; 21, 23, 27, 29, 31. (29 Sep)
Section 2.6. Problems 9,11, 15, 17, 19. (27 Sep)
Section 2.5. Problems 1-15 odd. (25 Sep)
Section 2.4. Problems 29 and 33. (22 Sep)
Section 2.4. Problems 1-17 odd; 21, 23, for the 6h and 8th eds, replace 1 by 2. 9 by 10, 11 by 12, and 13 by 14. (20 Sep)
Section 2.3. Problems 1-19 odd; 25(a) (for the 6th and 8th eds, 2-10 even; 11-19 odd 25(a)); and
A tank is initially filled with 500L of brine containing 5 kg of salt. Brine with a concentration of .2 kg per liter runs in at a rate of 5L per minute. The tank empties at a rate of 6L per minute. How much salt will be in the tank after 20 minutes?
Section 2.2. Problems 1,3,5,7,11,25,27(a),(b);29,30,31,33. For the 6th and 8th eds, replace 7 by 8 and 11 by 12. (6 Sep)
Section 1.4. Problems 3 and 9(but only on the interval [1,1.3] and not [1,2]). Same for the 6th and 8th eds. (1 Sep)
Section 1.3. Problems 1,3,5,7,11,13,15,17. For the 6th and 8th eds replace 1 by 2. (30 Aug)
Section 1.2. Problems 1,3,7,9,11,15,17,21; 23-31 odd. For the 6th and 8th eds: 2,4,8,10,11,15,17,21;23-31 odd. (25 Aug)
Section 1.1. Problems 1-17 odd. For the 6th and 8th eds: 2,4,6,8,10; 11-17 odd. (21 Aug)
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