Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

What has one letter and starts with an E?

What does this mean?

CCCCCCC

What goes up but never comes down?

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

Can you find the missing piece of the Porsche?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

Why is the longest human nose just 11 inches?