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CK-12 Foundation is a non-profit organization with a mission to

reduce the cost of textbook materials for the K-12 market both

in the U.S. and worldwide. Using an open-content, web-based

collaborative model termed the FlexBook®, CK-12 intends to pioneer

the generation and distribution of high-quality educational

content that will serve both as core text as well as provide an

adaptive environment for learning, powered through the FlexBook

Platform®.

Copyright © 2011 CK-12 Foundation, www.ck12.org

The names “CK-12” and “CK12” and associated logos and the

terms “FlexBook®”, and “FlexBook Platform®”, (collectively

“CK-12 Marks”) are trademarks and service marks of CK-12

Foundation and are protected by federal, state and international

laws.

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in whole or in sections must include the referral attribution link

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Except as otherwise noted, all CK-12 Content (including

CK-12 Curriculum Material) is made available to Users

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and updated by Creative Commons from time to time (the “CC

License”), which is incorporated herein by this reference.

Complete terms can be found at http://www.ck12.org/terms.

Printed: February 28, 2012

AUTHORS

Kathryn Dirga, (KateD)

Lori Jordan, (LoriJ