Which of the following situations combine to make zero?
A. The temperature falls 10 degrees below zero and then rises to 10ºF.
B. A friend borrows $20 and promises to return double the amount.
C. A start-up business has income equal to its expenses.
this is because for example if a company spent x amount of dollars to get it up and running, once they are makeing money they would have made the same amount they spent all put it to zero because they didn't make or loose any money
