The Nature of Mathematics, 12th Edition
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Chapter1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
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Links

    Video

Linear Inequalities  (time: 6:25)
http://www.youtube.com/watch?v=VgDe_D8ojxw

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Reference Topics

This site discusses solving linear inequalities:
http://www.analyzemath.com/Linear_Inequalities/Linear_Inequalities_Tutor.html

This interactive site gives practice solving linear inequalities:
http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_OneVariableSolvingInequalities.xm