Vt(a) Use the graph to estimate, to one decimal place, the average rate of change of V(t) with respect to t over the interval [0, 4] 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 2000 and 2004.(b) Over which 2-year period(s) was the average rate of change of V(t) the least? (Select all that apply.) HINT [See Example 2.][2, 4][4, 6][6, 8]The following graph shows the approximate value V(t) of subprime (normally classi?ed as risky) mortgage debt outstanding in the United States. Subprime debt outstanding1,4001.2001,000 3 (Billions)§ o 2 4 6 82000 2008Year (I) (a) Use the graph to estimate, to one decimal place, the average rate of change of V(t) with respect to 1 over the interval [0, 4] 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 $ billionper year between 2000 and 2004. (b) Over which 2year period(s) was the average rate of change of V(t) the least? (Select all that apply.) HINT [See Example 2.]D [2, 4] D [4. 6]D [6, 8]

# The average rate of change

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