Nora and Vera are trying to find difference of 10 - (-3). Nora thinks the differences seven vera claims the difference is 13 who is correct explain.

Vera would be correct, the difference is 13. This is because the negative outside the perenthesis will distribute to the -3, making it a positive 3. (Because two negatives make a positive. You then add 10 and 3 and get 13.