Answer;
4 shredder models per year
Explanation;
Here, we want to get the average rate of change in the number of shredder models manufactured per year between 1998 and 2005
What we have to do here is to find the difference between the year numbers and the number of shredder models in these years (the difference). Then we divide the difference in number by the difference in the year
Mathematically, we have this as;
Approximately, the average rate of change is 4 shredder models per year