Question

Tangle algebra and a simple limit problem. GET SOME STRING AND PLAY ALONG! =D

Answer 1

instructions unclear; my guitar needs new strings

Answer 2

So first off we draw 0. it's just two parallel strings. The important thing is the connections on the four corners. So we can equivalently say that this is also 0 because we can move this around without touching the corners to get 0 as well:

Now how do we add and subtract? Before we get to fractions we need to talk about integers! Coming up. Start looking for two shoelaces or some headphone cables or phone chargers haha.