Section 7.4
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Holt Example 1
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=6463/6463.xml
Holt Example 2
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7146/7146.xml
Holt Example 3
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7147/7147.xml
Holt Example 4
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7148/7148.xml
Holt Example 5
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7149/7149.xml
Holt Example 6
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg2/player.html?contentSrc=7150/7150.xml