877.7 is the correct answer!
Answer: 4, -1, [see if you can figure it out]
Step-by-step explanation:
Answer: 22 minutes
Step-by-step explanation: 500-170 means that he drained 330 gallons of water so 330 divided by 15 gallons a minute so you get 22 so it takes 22 minutes to have 170 gallons left in the pool