Final answer:
To find the rate of miles per gallon, divide the number of miles the car can travel on a full tank by the number of gallons of gas in the tank. In this case, the car can go 840 miles on 24 gallons of gas, so the rate is 35 miles per gallon.
Step-by-step explanation:
To find the rate of miles per gallon, we divide the number of miles the car can travel on a full tank by the number of gallons of gas in the tank. In this case, Frieda's car can go 840 miles on 24 gallons of gas. So, the rate of miles per gallon would be:
840 miles / 24 gallons = 35 miles per gallon