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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

what one word does the below rebus identifies?

One fine day, an intellectual man came to the emperor's court with the aim of testing Birbal's wittiness. In order to do this, he challenged Birbal to answer his question and hence prove that he was as intelligent and witty as he was said to be.
He asked Birbal, Do you want me to ask one difficult question or a hundred easy ones?
Since both Akbar and Birbal had had a tough day and were eager to leave, Birbal hastily told the intellectual to ask him a single difficult question.
Intellectual: OK. Tell me what came first into the world, the egg or the chicken?
Of course, the chicken, Birbal replied with a smile.
This time with a note of victory in his voice, the intellectual asked Birbal, How will you demonstrate that?
What did Birbal say?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

I have an eye but still cannot see.

Who am I?

What does this rebus means ?

PROG WORKRESS

If eleven plus two equals one, what does nine plus five equal?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?