Remember: Negative plus negative equals negative Negative plus positive equals positive (under circumsatnces) Postive minus positive equals positive (when the first number being subracted from second number is a larger number) You do -16+56 which is 40 and so then 40-63, is -23 (for one week). So then you do 56-63 (for week two), you then get -7. So then you add -23+-7 and get -30 so he has -30£. In other words he is in debt by 30£.
