CK-12 Foundation takes content errors seriously, and will fix them as quickly as possible.
FlexBook® Textbook or Concept Errors
How to report an error found in our textbooks or concepts:
Please fill out this form with the details.
Practice Question Errors
How to report an error found in our practice questions.
- Go to the practice question.
- Click Improve this question.
- Select the option on how we can make an improvement
- Select which statement describe the issue and provide more details.