It does not need to have a hyphen! :)
No, the word "nineteen" does not need a hyphen when written numerically.
No
It's not a word in the dictionary, so yes, use the hyphen.
You typically need only capitalize after sentence-ending punctuation, which a hyphen is not.
I do not believe that multitasking is supposed to have a hyphen.
No
no
No.
no
Yes, in-home does need a hyphen. It's two words put together to form a word for a different concept.
nope