The amount in Ebony's bank account is a function of the number of days d since she opened the account. The graph shows segments representing her day-by-day bank balance. Although there are no labeled tick marks on the graph, you can answer the questions by using the additional given information as well as your general knowledge of graphs of functions.

(Score for Question 1: ___ of 4 points)

1.Ebony kept her bank account open for only 3 weeks, and the graph shows the entire 3 weeks. During that time, her greatest balance was $400.

(a)Give the domain and range of the function.

(b)Give an estimate to the nearest hundreds for . Explain how you determined your estimate and tell what means in context of the situation.

(c)Ebony's bank balance first reached $0 on Day 12. How would you show that information in function notation?

(d)Ebony's bank balance remained at $0 from Day 12 through Day 15. As you count segments from the left, which segment on the graph1, 2, 3, 4, 5, or 6 represents that information? Explain how you know.