CK-12's Texas Instruments Trigonometry Student Edition Flexbook is a helpful companion to a trigonometry course, providing students with more ways to understand basic trigonometric concepts through supplementary exercises and explanations.

CK-12's Texas Instruments Trigonometry Teacher's Edition Flexbook is a helpful companion to a trigonometry course, providing students with more ways to understand basic trigonometric concepts through supplementary exercises and explanations.

CK-12 Trigonometry Teacher's Edition provides tips and common errors for teaching CK-12 Trigonometry Student Edition. The solution and assessment guides are available upon request.

From CK-12, U.S. History Sourcebook - Advanced covers U.S. history from Colonial America through World War I. This book provides high school U.S. History teachers and students with sets of primary and secondary sources about important topics. Some teachers will use it as a supplement to a traditional textbook. For those looking to leave the textbook behind entirely, it will provide a course with basic structure and continuity, and will reduce the burden of finding new primary sources for each class meeting. However, it is not yet comprehensive enough to meet the coverage requirements of, for example, an Advanced Placement test.

From CK-12, U.S. History Sourcebook - Basic covers U.S. history from Colonial America through World War I. This book provides high school U.S. History teachers and students with sets of primary and secondary sources about important topics. Some teachers will use it as a supplement to a traditional textbook. For those looking to leave the textbook behind entirely, it will provide a course with basic structure and continuity, and will reduce the burden of finding new primary sources for each class meeting. However, it is not yet comprehensive enough to meet the coverage requirements of, for example, an Advanced Placement test.

Understanding Biodiversity presents an overview of biodiversity, its importance and relevance to humans, all living things, and the Earth. It includes species pages and a template to engage and involve students in real-life data collection.

This chapter introduces students to the basics of reading literature. It introduces students to subjective and objective reading, and goes over the basic ideas behind reading for plot, character, setting, and theme. Learning objectives are: Ask subjective and objective questions about what they have read; Learn the meanings of “tone,” “diction,” and “syntax.”; Identify the major elements of a plot; Identify character, setting, and theme; Differentiate between internal and external conflict.