I've never seen it hyphenated
The correct spelling of hyphen is nephyh
After-school (you have to include hyphen between them).
Yes. "Hard-working" is a compound adjective, and therefore requires a hyphen between the two words. It is also correct to omit the hyphen and use the single word, "hardworking."
No, a hyphen is not required.
The correct spelling of the 45-letter word (coined to be the longest in the dictionary) ispneumonoultramicroscopic-silicovolcanoconiosis(a form of silicosis, a lung disease).*There is no hyphen in the word. The hyphen is required to fit the limitations of this page.
That is the correct spelling of "cosigner" (a joint warrantor or guarantor).This is often seen in the hyphenated form co-signer, but the hyphen is not required.
If you mean the word for 19, then there is no hyphen and it is nineteen, not nine-teen.
Yes, the correct spelling is "non-renewable." The hyphen is used to connect the prefix "non" with the root word "renewable" to indicate that something is not renewable.
No, decision making does not have a hyphen. It is considered a compound noun that is used without a hyphen.
Dry aged steak is correct with or without a hyphen. Dry-aged steak is correct with or without a hyphen.
A hyphen is not required.
No, a hyphen is not needed.