Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Look at the picture and find out which square is not linked with any of the other squares.

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

What's a single-digit number with no value?

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

Can you name some countries which do not have the alphabet 'A' in them?

What has a bottom at the top?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?