PA
Virginia is abbreviated VA
You should write, "10 a.m." There is a space after the number. There are two letters of the abbreviation because they represent two words: ante meridiem.
There is no abbreviation. You have to write it in full.
As in Bachelor of Science? Technically, it's grammatically correct. However, the APA frowns upon it. So yes, but you shouldn't.
It's four letters, it needs no abbreviation. Write it.
It's four letters, it needs no abbreviation. Write it.
appre
Do you mean what is the abbreviation for millimeter? Because that is "mm". When you write units in fractions, you will probably want to use the abbreviation.
Yes, sig is an abbreviation for signa, which means "write."
United States Cavalry University of Southern California University of South Carolina ....if you write back in with the actual sentence, we may be able to give you additional help
abbreviation