A graph of Q = 12e-0.14t is given in the figure. (a) What is the initial value of Q (when t = 0)? Q(0) = help (numbers) (b) This quantity decays at a continuous rate of G % help (numbers) (c) Use the graph to estimate the value of t when Q = 2. help (numbers) t≈ (d) Use logs to find the exact value of t when Q = 2. t= help (logarithms) 12 10 co 8 6 A 2 2 4 (Click on graph to enlarge) 6 8 10 12 t

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