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

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

what does this below rebus represent identXQQQQQME

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What is always in front of you but can’t be seen?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

What building has the most stories?

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?

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?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?