12.3: 6, 10, 22, 23, 28, 31, 43* (Optional: 4, 7, 19, 20, 21, 26, 27, 30, 41) *Note don’t solve integral in 43, just sketch region and set up reversed order of integration.
12.4: 4, 11, 16, 20, 27 (Optional: 1, 8, 22, 30)
12.5: 2, 8, 13 (Optional: 10, 17)
12.6: 1, 4, 5 (Optional: 2, 8)
12.7: 4, 17, 19, 27, 43, 46 (Optional: 6, 9, 18, 20)