No.
if the sentence was the other way around, you would need a comma. ie: Because she studied really hard, Shauna got an A in her chemistry test.
Answer:
Hi everyone, what are you all up to?
Explanation:
This sentence needs to be capitalized and have a comma after everyone to be grammatically correct.
(Yeah I get this isn't a question but I'm answering it properly anyway.)
The sentence is imperative meaning the subject is (you)
I'm sorry, but this question doesn't make any sense? Could you explain it a bit? You should also consider if this question fits in the subject English? Maybe better in math?
