What does the below mathematical rebus mean?

What has a ring but no finger?

What can jump higher than a building?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

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

Can you name four days which start with the letter 'T'?

The Little ant seems to be always confused. Do you know why?

What is the coolest letter in the alphabet?

What part of Turkey has the most feathers?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?