Americans combined drive about 4.0*10⁹ miles per day and their vehicles get an average of 20 miles per gallon of fuel used. For each 1 kg of gasoline that is burned, about 3.0 kg of CO₂ are produced. How many kilograms of CO₂ are emitted into the atmosphere each day by cars in the U.S. One gallon of gas weighs about 3.5 kg.

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The correct answer is A because:Americans drive about 4.0*10^9 miles per day and their vehicles get an average of 20 miles per gallon of fuel used. So, they use 4.0*10^9 miles / 20 miles/gallon = 2.0*10^8 gallons of fuel per day. For each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced. One gallon of gas weighs about 3.5 kg. So, 2.0*10^8 gallons of fuel * 3.5 kg/gallon * 3.0 kg CO2/kg fuel = 2.1 * 10^9 kg of CO2 are emitted into the atmosphere each day by cars in the U.S.

Americans Combined Drive About 4