From the syllabus:

We consider the graded homework assignments to be the minimum amount of homework required to pass the course; working only the required homework assignments will not guarantee an A in the course! We highly encourage students to work additional problems, so as to better learn the material for exams and quizzes. Additional recommended problems will be listed on the course website and will come from the book.
• Recommended Problems 1 (Concurrent with Homework Assignment 1)
Chapter 1: 3, 9, 34, 38, 44, 51, 55, 58, 73, 83
Chapter 2: 2, 7, 11, 25, 31, 36, 50, 55, 58, 62
Chapter 3: 6, 23, 25, 32, 44, 45, 48, 63, 67, 72, 79, 82, 88, 93

• Recommended Problems 2 (Concurrent with Homework Assignments 2 and 3)
Chapter 4: 3, 10, 18, 30, 37, 46, 57, 63, 74, 75, 76, 80, 86, 98

• Recommended Problems 3 (Concurrent with Homework Assignment 4)
Chapter 7: 1, 7, 8, 10, 14, 18, 23, 25, 30, 34, 36, 40, 42, 53, 57, 62, 90

• Recommended Problems 4 (Concurrent with Homework Assignment 5)
Chapter 6: 2, 6, 8, 13, 19, 24, 27, 32, 34, 37, 39, 43, 48, 50, 53, 61, 63, 69, 84 (not c)
Chapter 5: 2, 4, 8, 11, 19, 23, 27, 29, 34, 38, 41, 44, 51, 74, 76, 78

• Recommended Problems 5 (Concurrent with Homework Assignment 6)
Chapter 8: 5, 6, 8, 15, 19, 25, 30, 34, 35, 48, 55, 59, 62, 65, 68, 74, 78, 90, 92

• Recommended Problems 6 (Concurrent with Homework Assignment 7)
Chapter 9: 2, 5, 8, 10, 17, 32, 39, 42, 43, 50, 51, 88, 92, 97

• Recommended Problems 7 (Concurrent with Homework Assignment 8)
Chapter 10: 2, 5, 8, 19, 25, 27, 32, 35, 47, 53, 55, 58, 62

• Recommended Problems 8 (Also concurrent with Homework Assignment 8)
Chapter 11: 1, 3, 10, 16, 20, 21, 27, 31, 32, 41, 47, 49, 52, 59, 65
Chapter 12: 2, 5, 6, 10, 14, 18, 19, 27, 28, 30, 34, 37, 42, 44, 49, 51