Awater tank is emptied at a constant rate. at the end of the first hour, 36,000 gallons of water were in the tank. after 6 hours, 21,000 gallons remained. how many gallons of water were in the tank at the end of the fourth hour?

Someone answer asap for ! the boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a. e = 2b - 212 b. b = 2e - 212 c. e = -2b + 212 d. b = -2e + 212