Answer:1.01 x10^11 kg of carbon dioxide per annum
Explanation:
Consumption rate is 18.7 per gallon
Consumption of gasoline =4590x1 gallon/18.7=264.70 gallons
Since there are 40 million cars and each car consumes 264.70 gallons
therefoere wee will have
40,000,000 x 264.70=1.058x10^10gallons
1gallon produces 9.50 kg of carbon dioxide,
therefore, 1.058x10^10 will produce
1.058x10^10 x 9.50kg=
1.00586 x10^11kg of carbon dioxide per annum
= 1.01 x10^11 kg of carbon dioxide per annum