A coin sold for 259 in 1979 and was sold again in 1986 for 434 Assume that the growth in the value V of the collector s item was expon a Find the value k of the exponential growth rate Assume V 259 k Round to the nearest thousandth b Find the exponential growth function in terms of t where t is the number of years since 1979 V t c Estimate the value of the coin in 2012 Round to the nearest dollar d What is the doubling time for the value of the coin to the nearest tenth of a year years Round to the nearest tenth e Find the amount of time after which the value of the coin will be 3451 years