No hyphen is needed for world class. World is just an adjective that describes class much like (for example) upper class, which also does not need a hyphen.
The dictionaries that list it use a hyphen.
No, excitingly is one word so you would not use a hyphen in it.
You do not use a hyphen when writing square feet. Using a hyphen would make it one word which should not be the case.
It isn't in the dictionary, so it'd be best to use a hyphen.
That is the correct spelling of the adjective "world-renowned" (famous).
no
"World renown" is a noun -- "A man of world renown." "World renowned" is the descriptive adjective phrase -- "The world renowned Copper Canyon in Mexico."
Yes, whenver using square-foot you should use a hyphen
It's not a word in the dictionary, so yes, use the hyphen.
In a range name instead of using a space or hyphen, use a?
A hyphen is a "dash" that we use to put a compound word together. Such as 24-hour clock or 42-foot.