why number 8549176320 is one of a kind?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What occurs twice in a week, once in a year but never in a day?

Can it be possible to build a house that has all its four walls facing towards the South?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

I can write cow in 13 letters.

Can You?