The table shows U.S. gross domestic product (GDP) in billions of dollars for selected years from 2000

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The table shows U.S. gross domestic product (GDP) in billions of dollars for selected years from 2000 to 2070 (actual and projected).
Year GDP Year GDP 2000 9143 2040 79,680 103,444 133,925 173,175 2005 12,145 16,174 21,270 2045 2010 2050 2055 2015 2020

Assume the GDP can be modeled with the function
G(t) = 212.9(0.2t + 5)3 - 5016(0.2t + 5)2 + 8810.4t + 104,072
where G(t) is in billions of dollars and t is the number of years past 2000.
(a) Use the model to find and interpret the instantaneous rates of change of the GDP in 2005 and 2015.
(b) Use the data in the table to find the average rate of change of the GDP from 2005 to 2015.
(c) How well does your answer from part (b) approximate the instantaneous rate of change of GDP in 2010?

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