Respuesta :
You have -9 -(-10). So when you have a subtraction symbol next to a negative, just like this problem. You will then have a positive 10.
So...
Negative and a Positive make a [Negative]
Positive and a Negative make a [Negative]
Positive and a Positive make a [Positive]
Negative Negative make a [Positive]
Then you add -9 and 10. You go closer to the 0. Then you have 1.
So...
Negative and a Positive make a [Negative]
Positive and a Negative make a [Negative]
Positive and a Positive make a [Positive]
Negative Negative make a [Positive]
Then you add -9 and 10. You go closer to the 0. Then you have 1.
