PLS HELP QUICKLYY Ivy has purchased 150 songs from the internet. She plans to download an equal number of songs each week for 5 weeks. The graph show the number of songs left to download, y, for a certain amount of weeks, x.
Part A: What is the rate of change represented by the graph? What does the rate of change represent in this situation? Show or explain how you found this. (3 points)

(there is photo, witch is the graph)

I already know the initial value and rate of change, the only question I don't know is
"What does the rate of change represent in this situation?"

So pls help quickly! It is due today!