Section 3.1
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Holt Example 1
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=6422/6422.xml
Holt Example 2
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7975/7975.xml
Holt Example 3
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7976/7976.xml
Holt Example 4
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7977/7977.xml