If the images you show are not your own intellectual property, you can legally display them in a college classroom because they are covered by the fair-use provisions of U.S. copyright law. However, if you display them in a business presentation, you would need formal written permission from the copyright holders. See Ch. 2, pp. 24–26, for more information.

Money: Bureau of Engraving and Printing. Chains on laptop: Elnur/Shutterstock. Mobile Clinical Assistant: Courtesy of Panasonic Corporation.