1. **State the problem:** Isabelle needs to reduce her remaining practice hours by driving 4 hours a week for 3 weeks. We want to find expressions that represent the change in her remaining practice hours. 2. **Understand the situation:** Each week, Isabelle drives 4 hours, so the total hours driven in 3 weeks is $3 \times 4 = 12$ hours. 3. **Change in remaining hours:** Since she is reducing the remaining hours, the change is negative. So, the change is $-12$ hours. 4. **Check each expression:** - a) $3 \times (-4) = -12$ which correctly represents the change. - b) $(-3) \times (-4) = 12$ which is positive, so it does not represent a reduction. - c) $(-4) + (-4) + (-4) = -12$ which correctly represents the change. - d) $(-4) \times (-4) \times (-4) = -64$ which is not the correct change. - e) $(-3) \times (-3) \times (-3) \times (-3) = 81$ which is positive and unrelated. 5. **Conclusion:** The expressions that represent the change to her remaining practice hours are **a) $3 \times (-4)$** and **c) $(-4) + (-4) + (-4)$**. **Final answer:** Expressions a and c represent the change in remaining practice hours.