Final answer:
A reasonable domain for Leslie's car, given its gas mileage and tank size, is the interval [0, 14] for the number of gallons of gas since the car holds up to 14 gallons when full and gets 25 miles per gallon.
Step-by-step explanation:
The question asks about determining a reasonable domain for Leslie's car given its fuel efficiency and gas tank capacity. Leslie's car gets 25 miles per gallon of gas and the car's gas tank needs 14 gallons of gas to be full. A reasonable domain is a set of input values considered within a real-world context. The number of gallons that can be put in the car's tank can be any number from 0 gallons, when it's empty, to 14 gallons, when its full. Therefore, the domain for the number of gallons of gas in Leslie's tank would be from 0 to 14. These values are presented in the form of the interval [0, 14].