I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

How many times can you subtract the number two from the number fifty?

What word begins and ends with an E, but has only one letter?

John was piloting a plane behind a car but was never able to overtake it. Why?

How can you take 2 from 5 and leave 4?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

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?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?