Answer: Timeline
Explanation: The reader can know and understand what events happened and when without having to read so much.
Answer:
West Egg is a little bit poorer than East Egg
Answer:
By sympathizing with the young couple.
Explanation:
The whole story is narrated mainly in third person. There are a few times where the narration shifts into first person but the narrator does not seem to be another character in the story and does not expand his view beyond Della's.
The gray room was awfully dull.