Answer:
1. 1,439.5 miles
2. 630 miles
Explanation:
1. The odometer is the number of miles on the car throughout its entire lifespan. When a car is new and just built, the odometer has a reading of 0. As you drive, each mile is added on the odometer. If you start your trip at 18,594.3 and you travel and stop when it reads 20,023.8, then the difference between the two is you total miles traveled.
20,023.8
-18,594.3
________
1,439.5
You traveled 1,439.5 miles.
2. Miles per gallon is the number of miles you can drive on 1 gallon of gas. If you have 30 gallons then you can try 30 times as much. Your SUV can go 21 miles on 1 gallon of gas. Then on 30 gallons it can go 21*30=610.