What is a set of three dots at the end of a number to indicate that the number will infidently continue in the same pattern?

Idk if it’s the same in math but if you’re writing it’s called an ellipsis.

I know if you have a line over the top of a number after a decimal it would be referred to as a repeating number, and this is basically the same thing as said ellipsis in math.

Idon’t know this and this isn’t middle school work

Here are the answers to the ones that i could see.