You can show or hide solutions for questions that include them (many questions do not). A solution supplements the answer key by explaining the process for obtaining the correct answer. Usually, you should show solutions only after the due date to ensure that no students see the solutions before submitting responses.
You can show or hide worked solutions for the assignment or for specific questions. You can also choose to show solutions before the due date only after students have made a certain number of submissions. Question-specific settings apply only before the due date.
To show worked solutions, you must also enable showing the answer key. The answer key must be displayed to students with or before the worked solution.