The United States is the world’s largest
consumer of petroleum; China is second. In 2000, the United States
consumed 19.7 million barrels per day; this increased to 20.7 million
barrels per day by 2007. In 2000, China consumed 4.8 million barrels
per day; this increased to 7.6 million barrels per day by 2007.
Find exponential equations for the oil consumption of each country, where y is millions of barrels of petroleum per day and x is the year after 2000. Assume the yearly growth rate has been constant in each country.

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\[ y= Ae^{kt} \]
A is your initial value at time=0 (year 2000)
solve for k using the 2nd data point

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