One gallon of gasoline in an automobiles engine produces on
average 9.50 kg of carbon dioxide, which is a greenhouse gas; that
is, it promotes the warming of Earth's atmosphere. Calculate the
annual production of carbon dioxide in kilograms if there are
exactly 40.0 million cars in the United States and each car covers
a distance of 7870 mi at a consumption rate of 21.0 miles per
gallon. Enter your answer in scientific notation.