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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Solve the mathematical equation in the picture below.

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Who are the happiest people in IPL match?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

Can you solve the below geography rebus by decoding the below rebus ?