No they aren't proper to use in writing class they are considered slang. It would show your teacher that your not interested in sounding educated and proper.
Hope this helps!
(-5,2) should be correct i think
This is true...............
Answer:
The first part option "A" is correct
a) Please send the memo to: Boston, New York City, and Los Angeles.
The second part option "B" is correct
b) I practiced my presentation for three hours this afternoon; it is on management strategies.
Explanation:
The punctuation is based on words and sentence agreement.
