Ms. Johnson was taking measurements in the Arctic Ocean and measured a temperature of -14.4 degrees Celsius. The temperature inc
reased 8.4 degrees over the next 6 hours, followed by a decrease of 7.25 degrees over the following 6 hours. What was the final temperature after both of these measured changes?
3k and -k are both like terms, so you can combine them. Adding opposite signs works in the same way as subtraction, so you can rewrite the expression as 3k-k, which is 2k.
