Draw a number line with 10 positives and 10 negatives. Count from 0 to 8. Now, from 8, count back 12 spots. From that spot, go back to 0, which is their original position. The number you counted there is your answer.
The answer would be 4 yards.The expression would be n+8-12 n could be any number so if it was 1 then it would be 1+8-12 which would be -3 you then should know that you would need to add 4 to -3 to make it to the original number which was 1.This works for any other number that you put for n
