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

The more you take me, the more you leave me behind.
Who Am I?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Which tank will fill first?

I know a nine-letter word having only one vowel.
Do you ?

John was drowned by he was not wet. How?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?