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

What is the next number in this series?

4,12,84,3612....

A girl rode into a tourist spot out of the city on Thursday. She loved the place and decided to stay for a few days. She stayed for four days and then she left for back home on Thursday.

How can this be possible?

Next Number in the Series,

5, 16, 49, 104, ?

Can you write down eight eights so that they add up to one thousand?

What kind of tree can you carry in your hand?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

How is the moon similar to a dollar?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?