Part A: Since we do not want to multiply or subtract OR add, we can divide by describing the expression like this -15 divided by 5, or -15/5.
Part B: In order to simplify, we need to divide -15 by 5. So we can change the -15 to a positive 15. 15 divided by 5 is 3, which we need to put negative back in, which is -3°c. We now know that every 5 days would equal to -15°c, while every day equals to -3°c.
