Is it true that the style of writing in a research paper is formal

Can someone me with an english language arts assignment? i need someone who's an expert or good at english language ! i need correct answers only !

Me read the letter. dear aunt mary, you for the wonderful painting. you are so talented! i was thrilled that you chose to paint horses. you must have remembered that i was crazy about horses when i was a little kid—and i still love them. i have hung the painting in my room so that i can see it every morning when i wake up. your loving niece, celia what makes this letter appropriate for its intended audience? it is written from the third-person point of view. it is concise and impersonal. its sentence structure is varied. its language is informal.

Aclear technical document includes which element? a. complex sentence structure b. section headings c. abstract technical vocabulary d. long paragraphs