Where can I find the previous answers I gave?

To find the answers you have provided to others, simply click on the robot icon on the top left on the Questions tab and click on the "Past answers" menu. You will then see the list of all the questions you received and the answers you gave.

This is different from searching and finding the answers that people gave to the questions you have asked to them. Those answers can be found in the Answers sub menu on the right side of the main Questions screen.