Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What is the coolest letter in the alphabet?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What number divided by 4 is the same as that number minus 4?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

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.