Answer:
To answer a question on brainly, there is a add answer button below the question. Please look at the attached, it shows you the add answer button.
Explanation:
Once you click on add answer, brainly will take you to something that looks like a note and all you have to do is type the answer and explanation. Once you do that, click on the add your answer button on the top right corner, and your answer will be posted.