Would each situation be represented by a positive or a negative number? column a column b 1. 1.5 acres of rainforest are destroyed every second for s seconds. express the change in acreage of rainforest. 2. a tub of water is heated by 0.3 degrees per minute for m minutes. express the change in temperature. 3. a submarine descends at a rate of 0.9 m/s for 90 s. express the change in altitude relative to sea level. 4. a credit card account has 2 charges of $15 and no payments. express the balance of the credit card. a. positive b. negative