using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Take away the whole and some still remain. What is it?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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 ()

How can you take 2 from 5 and leave 4?

Where do you go to learn how to make ice cream?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

What Deficiency does the below rebus represent?

VIT_MIN