In Exercises 7–10, give three ordered pairs from each table. Percent of High School Students Who Smoke
| Year | Percent |
| 1997 | 36 |
| 1999 | 35 |
| 2001 | 29 |
| 2003 | 22 |
| 2005 | 23 |
| 2,007 | 20 |
Source: Centers for Disease Control and Prevention.
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