What does does this rebus picture means ?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Find out which of the given views in the picture is accurately the top view of the given pyramid.

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?

What is the next number in this series?

4,12,84,3612....

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

How many triangles can you find in this given picture?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?