Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What do you think with the below Picture ?

What do you see in the given picture?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

What do you answer even though it never asks you questions?

In the image given, you can find several triangles. Can you count them all?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?