-7
Explanation:
Start at -8
Move to the right 13
*by now your at positive 5*
Move to the left 6
*by now your at -1*
Increase/add 4/ go to the left 4
*by now your at positive 3*
Decrease/subtract 10/ go to the right 10
*by now your at -7*
Therefore your answer is -7
