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College math textbooks are expensive, but professors continue to adopt them. One reason is that the textbooks are bundled with ancillary materials that make life easier for the professor, if not always the student. These materials include test generators, homework assignments, online homework systems, solution manuals, PowerPoint slide presentations, instructor manuals, and so on. Adjunct instructors must often teach at many different schools, and often have limited time to prepare, so they rely on these supplementary materials.

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