Final answer:
Illustrations, photographs, maps, and graphs can be found in various types of books or articles to enhance the content.
Step-by-step explanation:
An illustration might be found in a math book to visually represent a mathematical concept or problem. A photograph can be seen in a biography of an artist to show the artist's life and work. A map may be included in a nonfiction book about trade routes from Europe to the United States to display the routes and locations. Finally, a graph can be featured in an article about a new movie to present data or statistics related to the movie's performance.