The sentence is in past tense. This is noted by the ending -ed in the word healed.
The correct answer is: To establish your qualifications for speaking quuzlet.
Explicitly introducing one's qualifications to do anything at the start of a speech is not a common practice. If it happened, it would be done by someone else before the speaker steps on stage and the speech begins. Althought it may seem as an arrogant practice, a speaker may express their qualifications once having introduced themselves and the arguments to be presented.
The believe that you can't escape your destiny.
The change from 632 feet to 312 feet because there is a decrease. When there is a decrease it is modeled by a negative number. All the others show positive increase.