A doll sold for $253 in 1975 and was sold again in 1986 for $408. Assume that the growth in the value V of the collector's item was exponential. C a) Find the value k of the exponential growth rate. Assume V = 253. k= (Round to the nearest thousandth.) b) Find the exponential growth function in terms of t, where t is the number of years since 1975. V(t) = c) Estimate the value of the doll in 2009. (Round to the nearest dollar.) d) What is the doubling time for the value of the doll to the nearest tenth of a year? years (Round to the nearest tenth.)

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