Question

All real numbers at least 5 units from 8

Answer 1

\[(-\infty,3]\cup[13,\infty)\]

Answer 2

I think this is what you are asking, but Im not sure the question, or if this is the answer...lol

Answer 3

The question was to use interval notation to define each interval. I wasn't sure if infinity classified as a "real" number.

Answer 4

It's considered a extended real number, and we may write it as such.

example: we may say \[\large R=(-\infty,\infty)\]

Answer 5

What is the "U" looking symbol between the two notations?