I believe, when used as an adjective, it should be hyphenated but otherwise not.
E.g. It was a work-related injury.
E.g. The injury was work related.
No, the correct spelling is extracurricular. Adding extra does not require a hyphen. For example, extraterrestrial is extra+terrestrial (no hyphen needed).
You say "A hyphen" because the sound of the letter "H" at the beginning of the word "hyphen" is pronounced, making it a consonant sound.
No. Just looked it up in a printed dictionary. In fact, no work with the 'multi' prefix uses a hyphen. For example, multilateral
No, it does not have a hyphen.
It Is A Special Hyphen
A colon is this : and a hyphen is this -
multimedia - NO hyphen
hyphen
No there's not a hyphen.
It does not need to have a hyphen! :)
Non-breaking hyphen
does time-line have a hyphen