Who knows these?

Question

1)If someone is 36 years old, what year did theyu finish high school?
These are math Riddles so be careful!
2) How many sis-cent stamps are in a dozen?
3) From what non-zero number can you take half and leave nothing?
4) How can you make seven out of three 6's?
5) Why should you never mention the number 288 in front of your math teacher?
6) When does eleven plus two equal one?
7) How far can you go into a forest?
8)How many sides does a circle have?
9) How do you cut down pollution in math class?
10) What is the longest table in the world?
Thank you all!

Answer 1

1) assuming they graudated at 18 years old, 1989
2) 12 in a dozen
3)
4) (6/6)+ 6 = 7
5)
6)
7) halfway, after that you are coming back out
8) two, inside and outside
9)
10)

Answer 2

2. 12
3. one-half
7. the middle of the forest

Answer 3

Who came second in the second world war.

Answer 4

Sorry, I like short questions.

Answer 5

These are very easy questions. I'll let others answer them while I concentrate on the harder questions and riddles!