Question

2--3

Answer 1

5

Answer 2

2--3
2+3
5

So 2--3 = 5

Answer 3

Remember that subtracting a negative is adding. Ex: If you have 2 IOUs, and I subtract 1 IOU from you, then you'll have -2--1 = -2+1 = -1 dollars or 1 IOU left.