2.5 gallons= 40 cups
1 cup= 8 oz
8oz= 1 serving size
40 servings
I am pretty sure it's the second sentence.
For the first function, your rate of change is 3 and the initial value is -6.
For the second function, your rate of change is -2 and the initial value is 12.
Im pretty sure that it stays the same or is decreases to 600,000 but im gonna stick with my answer until someone else has a different one :)