Section 2.1
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Holt Example 1
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=6413/6413.xml
Holt Example 2
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7054/7054.xml
Holt Example 3
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7055/7055.xml
Holt Example 4
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7056/7056.xml
Holt Example 5
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7057/7057.xml