The number of CDs the students at your high school bought in 2008 is 100
The graph of the question is added as an attachment
From the graph, we have the following highlights:
2008 is 4 years from 2004.
So, the prediction is;
Year 2008 = 200 - 4 * 25
Evaluate
Year 2008 = 100
Hence, the number of CDs the students at your high school bought in 2008 is 100
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