Lesson 2.4 brings together all you learned in Unit 2. Quadratic functions can be used to model many real-life scenarios, and quadratic equations are used to determine answers to questions about real-life scenarios. As a result, being able to solve the word problems at the end of this lesson shows a deep understanding of the rest of the unit. The questions may be difficult at times, but they also can add a bit of awe and wonder to what mathematics is able to model.