I have teeth but i don't bite. Who Am I ?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Can you solve below mathematical equation?

2^1234 - 2^1233

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

There is something which is always coming but never arrives?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What Does this text mean:

important=important

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?