Chapter 4, Lesson 1: Exercise 2AB
Chapter 4, Lesson 1: Exercise 4A
Chapter 4, Lesson 1: Exercise 4B
Chapter 4, Lesson 1: Exercise 9AB
Chapter 4, Lesson 1: Exercise 11A
Chapter 4, Lesson 1: Exercise 14AB
Chapter 4, Lesson 2: Exercise 2A
Chapter 4, Lesson 2: Exercise 3AB
Chapter 4, Lesson 2: Exercise 6AB
Chapter 4, Lesson 2: Exercise 7AB
Chapter 4, Lesson 2: Exercise 11AB
Chapter 4, Lesson 2: Exercise 12B
Chapter 4, Lesson 3: Exercise 1C
Chapter 4, Lesson 3: Exercise 3A
Chapter 4, Lesson 3: Exercise 4AB
Chapter 4, Lesson 3: Exercise 7A
Chapter 4, Lesson 3: Exercise 7B