Section 7.6
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Holt Example 1
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=6466/6466.xml
Holt Example 2
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7154/7154.xml
Holt Example 3
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7155/7155.xml
Holt Example 4
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7156/7156.xml