Question

For 13 would you subtract because there's a negative and positive you always subtract and another question is would it be negative or positive

Answer 1

20

Explanation:

1. Whenever adding a positive to a negative, the answer will increase, it will be closer to zero and the positives than the original negative number.
2. So, -10 + 30 = 30 - 10
3. 30 - 10 = 20

I hope this helps!