Good Riddles

Question: How do you make the number one disappear by adding to it?

Question: A mirror for the famous, but informative to all.
I'll show you the world, but it may be a bit small.

What I am?

Question: How can you throw a ball 20 meters, and have it come back to you without hitting anything?

Question: What 3 positive numbers give the same result when multiplied and added together?

Question: I am the beginning of the end, the end of every place. I am the beginning of eternity, the end of time and space. What am I?