If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What does this Rebus Picture mean?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

What does this mathematical rebus means ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

A bomb exploded in a room full of married couples and no one died. How?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?