The kardashian family has a fish tank holding 20 gallons of water the water is leaking at a rate of 20 ounces per minute identify the domain and range of the function

F(x) = -20x + 2560x represents number of minutes

domain is ur x value(ur minutes) and the range is ur f(x) value (or y value)...which is the total amount of water left in the tank

     x            f(x) = -20x + 2560               y

 10           f(10) = -20(10) + 2560          2360
 20           f(20) = -20(20) + 2560          2160
 30           f(30) = -20(30) + 2560          1960
 60 (1 hr)  f(60) = -20(60) + 2560          1360

let me break it down for you..
at 10 minutes, there will be 2360 oz of water in the tank
at 20 minutes, there will be 2160 oz of water in the tank
at 30 minutes, there will be 1960 oz of water in the tank
at 60 minutes (or 1 hr), there will be 1360 oz of water in the tank
                 

The answer would be the second choice : )