The positive sign means that they got more, the negitive sign is how many that they used. There are no cups left at the end of the week because there is zero there. I think that there were 125 cups used on tuesday because that was how many that they used that day.
1- a negative number means how many cups they use to put coffee in that day. The total left over at the end of the week is 2339 cups. The amount of the cups used Thursday is 281. Hope this Helps.
