Replace the question mark with the correct number in the below-given picture?

What does this mathematical rebus means ?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Imagine you are in a room with no windows or doors. How will you get out?

Which is faster, Heat or Cold ? Explain.

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

What is the below Rebus indicate?