This Instructional Activity is a part of the Lesson 9, Unit 3, Grade 8. In this activity, the amount on the card is graphed with respect to days in July. For every new day, the amount on the card does not change; it does not go up or down at all. The purpose is for students to understand the meaning of a slope of 0 in this context. Show the image and ask students "What do you notice? What do you wonder?"