Is it correct to capitalize "everyone" in the following example or should it be lower case? and is there a rule i can refer to in the mla book?

example:

hello everyone,
welcome to the class! feel free to introduce yourselves.
sincerely,
miss jones

Read this sentence from the story of my life by helen keller. the most important day i remember in all my life is the one on which my teacher, anne mansfield sullivan, came to me. which element of plot does this sentence best represent?

Clearly show? ramona: anna, where does the theme seem to change? anna: according the article: "the fault lies with the fda's inability to release enough information in order to regain the public's trust. but perhaps japan is to blame as well. although there are plans to remove the spent nuclear fuel rods and build a permafrost wall around the four damaged reactors, is this really enough to recover damaged trust? " and then sato goes on to explain this statement. o a. challenging established ideas o b. using evidence to support your conclusions o c. asking clarifying questions o d. synthesizing claims into a single conclusion

“heartwork each day is born with a sunrise and ends in a sunset, the same way we open our eyes to see the light, and close them to hear the dark. you have no control over how your story begins or ends. but by now, you should know that all things have an ending. every spark returns to darkness. every sound returns to silence. and every flower returns to sleep with the earth. the journey of the sun and moon is predictable. but yours, is your ultimate art.” ― suzy kassem what does this quote mean to you? and why? i'm not looking for anything in particular, i just wanted to know. : )