If you've ever struggled to understand mathematics or wondered how you would ever apply what you've learned in your math courses, Gustafson/Hughes' popular COLLEGE ALGEBRA, 13th Edition is for you. This reader-friendly, clear edition offers precise coverage supported by numerous, easy-to-follow examples and many new or updated learning features. All content and learning support throughout this edition is designed to guide you and provide immediate help just when you need it. Revisions clarify the material with new exercises like Fix It that deepen your problem-solving skills and other exercises that strengthen your understanding of procedures. Review exercises and special modules help address any gaps in your knowledge. In addition, Tips, Cautions and color-coded boxes identify key vocabulary, concepts and problem-solving strategies. WebAssign tools for interactive review and reinforcement are also available to keep you progressing.

Launched in 1942, the Manhattan Project was a well-funded, secret effort by the United States, the United Kingdom, and Canada to develop an atomic bomb before the Nazis. The results-the bombs named "Little Boy" and "Fat Man"-were dropped on Hiroshima and Nagasaki in August of 1945. A vast state within a state, the Manhattan Project employed 130,000 people and cost the United States and its allies 2 billion dollars, but its contribution to science as a prestigious investment was invaluable. After the bombs were dropped, states began allocating unprecedented funds for scientific research, leading to the establishment of many of twentieth century's major research institutions. Yet the union of science, industry, and the military did not start with the development of the atomic bomb; World War II only deepened the relationship. This absorbing history revisits the interactions among science, the national interest, and public and private funding that was initiated in World War I and flourished in WWII. It then follows the Manhattan Project from inception to dissolution, describing the primary influences that helped execute the world's first successful plan for nuclear research and tracing the lineages of modern national nuclear agencies back to their source.

Soils of South Africa is the first book in seventy years that provides a comprehensive account of South African soils. The book arranges more than seventy soil forms into fourteen groups and then provides, for each group:

• maps showing their distribution and abundance throughout South Africa
• descriptions of morphological, chemical and physical properties
• a detailed account of classification and its correlation with international systems
• a discussion of soil genesis which includes a review of relevant research papers
• appraisal of soil quality from a land use perspective as well as for its ecological significance
• illustrative examples of soil profiles with analytical data and accompanying interpretations.

There is also a fascinating account of the special relationship that exists between South African animals and soil environments. Soils of South Africa should interest students and researchers in the earth, environmental and biological sciences, as well as environmental practitioners, farmers, foresters and civil engineers.

Stay focused and practice the math skills you'll need for success in other college courses and in your daily life with COLLEGE ALGEBRA, Twelfth Edition. This textbook has helped hundreds of thousands of students excel in the algebra course with its learning features and patient explanations. More than 400 worked examples include authors' notes, which explain the steps involved in the problem-solving process--and guide you to understanding and proficiency.