Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What has one eye, but can’t see?

The answer I give is yes, but what I mean is no. What was the question?

Keyboard words are not in alphabetical order, Why?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?