What is the word or phrase?

Using eight eights and addition only, can you make 1000?

Can you place six X (crosses) in below board without making three in a row in any way ?

In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?

Can you solve the maths in the below-given picture equation?

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?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?