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

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 ?

What does below chemistry rebus means?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

How far can you walk into the woods?

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

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

I am sure no one can have two things for dinner. what are they?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Complete the table series riddle by finding the number that can replace "??".