People make me, save me, change me, raise me. What am I?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Can anyone tell me a word in the English dictionary which has a silent 'z'?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

I am the fastest animal but cannot climb the tree. What am I?

The answer I give is yes, but what I mean is no. What was the question?

Can you place three balls such that the equation shown in the picture holds true?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?