no.
You do not hyphenate the number.
Generally co-author should be hyphenated, but the relaxed rules of modern times often present coauthor as one word
??
responsible
She is excited to coauthor a research paper with her colleague.
coauthor
no.
"Coauthor" can be a noun or a verb. As a noun, it refers to someone who writes a book or article with another person. As a verb, it describes the act of writing a book or article with someone else.
You do not need to hyphenate.
You do not hyphenate the number.
Don't hyphenate; ongoing is one word.
You hyphenate it only at the hyphen.
I think it's more accepted to hyphenate it.
Generally co-author should be hyphenated, but the relaxed rules of modern times often present coauthor as one word
Can you, or should you? You can hyphenate it if you're moving between lines in a paragraph and need to break up the word. You shouldn't hyphenate it normally.
You would hyphenate "thank you" when it is used as an adjective before a noun, such as in "a thank-you card."