You could embed something like KhanAcademy's practice: here and here in an iframe within canvas, and have students submit, as an assignment, screenshots of the site telling them the answer is correct. Since the questions are random, you can easily determine if students are sharing images. Also, they will have to practice until they get it right. They can obtain help, but if they do, they generally can't screenshot the "Way to go" without capturing part of the explanation. You could enforce images that capture white space under the graphs.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.