Final answer:
To calculate the gas mileage on the trip, divide the total miles traveled by the total gallons used. Matt's car got approximately 34 mpg on the first leg of the trip.
Step-by-step explanation:
To find Matt's car's gas mileage on the trip, we need to calculate the average number of miles per gallon. We can do this by dividing the total number of miles traveled by the total number of gallons used. On the first leg of the trip, Matt traveled 578 miles and used 17 gallons of gas. So, the gas mileage on this leg of the trip can be calculated as 578 miles divided by 17 gallons, which is approximately 34 mpg (miles per gallon).
For the return trip, Matt traveled 667 miles and used 23 gallons of gas. So, the gas mileage on this leg of the trip can be calculated as 667 miles divided by 23 gallons, which is approximately 29 mpg.
Therefore, the statement that completes the question correctly is: Matt's car got 34 mpg on the first leg of the trip.