Part A answer - It creates tension by revealing, for the first time, how nervous Ezra is about going out with Juliana.
Part B answer - Ezra lets out a "hoot" because he is so nervous about going on a date with Juliana, whom he has liked for years.
<u>Explanation:</u>
Ezra wanted to go out with Juliana on a date, and for that he wanted that his mother agrees to lend him her car. After several pleading Ezra’s mother got convinced and told him that he will have to return it after 3 hours. No extended time.
And after his mother and aunt left the house, Ezra started feeling nervous, this can best supported from the evidence that Ezra let’s out a hoot, he started dancing and shouting because he was finally going on a date with a girl whom he have been liking since for years.