How do you go from 98 to 720 using just one letter?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What is the end of everything?

I look at you, you look at me I raise my right, you raise your left. What am I?

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

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Find the smallest sentence with all the English alphabet.

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What makes this number unique: 8,549,176,320?