Section 2.3
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Holt Example 1
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=6415/6415.xml
Holt Example 2
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7062/7062.xml
Holt Example 3
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7063/7063.xml
Holt Example 4
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7064/7064.xml
Holt Example 5
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7065/7065.xml
Holt Example 6
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7066/7066.xml