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6. (1 point) 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. Subprime debt outstanding 1,400 1,200 1,000 800 (billion) 600 400 200 0 2 4 6 8 2000 2008 Year (1) 7. (1 point) Let f(x) = 3x2 -2x. Find the average rate of change of f (x) on the interval [a, a + h]. 8. (1 point) The price per barrel of crude oil can be approximated by the price function P(t) = 1.5t2 -19t + 108 (0