What is the coolest letter in the alphabet?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What goes up but never comes down?

Readers with the eyes of a hunter can find the snake in the field. Can you? Test your puzzle-solving skills now!

Can you write down eight eights so that they add up to one thousand?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Which is heavier: a ton of bricks or a ton of feathers?