Some question types allow to insert pictures or equations to answer choices. If they do, you will see the Add Picture and Add Equation buttons on choices added to such a question.
To add a picture to an answer choice:
To be able to insert formulas into your quizzes, you need to have the Microsoft Equation Editor installed. Usually, this program comes as a part of Microsoft Office installation.
The formula will appear in the answer choice. Note that you can add only a picture or an equation to one answer choice. If you already inserted a picture and then add an equation to the same choice, the equation will replace the previously added picture.
To remove a picture or a formula from a given answer choice, click the cross sign at the upper right corner of the picture/equation.