1. **Stating the problem:** Isabelle needs to complete 20 more practice hours. She drives 4 hours a week for 3 weeks. We want to find expressions that represent the change in her remaining practice hours. 2. **Understanding the problem:** Each week, she drives 4 hours, so in 3 weeks, she drives $3 \times 4 = 12$ hours. This reduces her remaining hours by 12. 3. **Representing change:** Since the remaining hours decrease, the change is negative. So, the change is $-12$ hours. 4. **Checking each expression:** - a) $3 \times (-4) = -12$ (correct, represents 3 weeks times -4 hours per week) - b) $(-3) \times (-4) = 12$ (positive, so incorrect for change) - c) $(-4) + (-4) + (-4) = -12$ (correct, sum of three negative 4s) - d) $(-4) \times (-4) \times (-4) = -64$ (incorrect, this is a product, not change over weeks) - e) $(-3) \times (-3) \times (-3) \times (-3) = 81$ (incorrect, unrelated to hours) 5. **Final answer:** The expressions that represent the change to her remaining practice hours are **a** and **c**.