Amy has a bowl of cereal for breakfast. the amount of cereal in the box (y) is determined by the number of days (x) that have passed since she purchased the cereal. The graph below shows that this relationship is a linear function. Consider an appropriate domain for this situation. What would be the greatest value for this domain?
I can't upload the graph. It's not working but here are the plotted coordinates:

0,48
1,44
2,40
3,36
4,32
There's no line connecting them.