Please Help For an increase, use a positive number.
For a decrease, use a negative number.

(a) Martina pumped 2 gallons of water into her pool each minute for 18 minutes. What was the total change in the amount of water in the pool?

(b) Frank removed 80 fish from his pond over a period of 10 days. He removed the same number of fish each day. What was the change in the number of fish in the pond each day?