We can say that a letter that begins with <em>I </em><em>need </em><em>your </em><em>help </em><em>ASAP </em>is informal because it is personal and direct.
We know that beacuse the sentence has been written to a trusted recipient and it uses abbreviations (ASAP).
Answer:
Isolation—this passage illustrates how sad Walton feels about having no one to share his success or failure with.
Typesetter to river pilot, prospector, newspaper reporter, lecturer, author, publisher, businessman and family man.
