No. Just looked it up in a printed dictionary. In fact, no work with the 'multi' prefix uses a hyphen. For example, multilateral
no
No, the word "nineteen" does not need a hyphen when written numerically.
It's not a word in the dictionary, so yes, use the hyphen.
nope
No. The word is "pinpoint".
No, the word "predetermine" is one word.
No, the word "coordinator" is one word.
No the word "midday" is not hyphenated.
The word "desperate" doesn't need a hyphen.
Yes, in-home does need a hyphen. It's two words put together to form a word for a different concept.
Yes it should be hyphenated.
Yes it should be hyphenated.