What does this simple rebus mean?

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

Which wheel of car does not rotate when you turn your car right?

What can jump higher than a building?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

You can see it everyday, But cannot touch it at will. What is it?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

You need to arrange three 7 and mathematical symbols to form number 1?

I am an odd number. Take away a letter and I become even. What number am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.