The annual revenue of Amazon rose from approximately $10.7 billion in 2006 to $34.2 billion in 2010.† (a) Use this information to find both a linear model and an exponential model for Amazon's annual revenue I (in billions of dollars) as a function of time t in years since 2000. HINT [See Example 2.] (Round all coefficients to three significant digits.) linear model I(t) = exponential model I(t)

Answer gross private domestic investment (gpdi);

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