Answer:
2
Step-by-step explanation:
We define 1 + 1 to equal 2 because it's useful. ... 1 + 1 = 2 because that's how we've defined it, in the same way that the word "cat" refers to small, furry, feline creatures because that's how we've defined it. Math is just a model. We define 1 + 1 to equal 2 because it's useful.