The following graph shows the approximate value V(t) of subprime (normally classified as risky) mortgage debt outstanding in the United States. Use the graph to estimate, to one decimal place, the average rate of change of V(t) with respect to t over the interval [2, 6] and interpret the result. The average rate of change is  , which means that the subprime mortgage debt outstanding was increasing at an average rate of around $  billion per year between 2002 and 2006.

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Exponential Growth Model

The relation that represents an exponential function is: