Hyphens are always used in compound numbers like twenty-one.
No.
No, a hyphen is not required.
No, a hyphen is not needed.
Yes, you should use a hyphen in "fifty-one" when it is used as a compound adjective or when it appears in a sentence as a number. For example, "There are fifty-one apples in the basket." However, when used as a simple number in a list or count, it can be written without the hyphen.
The correct spelling of hyphen is nephyh
It should be hyphenated if it's being used as an adjective.
No.
Tumblr URLs can't start or end with a hyphen.
No, faux pas doesn't require a hyphen.
yes you would spell it like this Ell[a] I think
Yes
Yes