The table lists future concentrations of CFC 12 in parts per billion (ppb), if current trends continue. Year 2000 2005 2010 2015 2020 CFC 12 (ppb) 0.72 1.01 1.42 1.99 2.79 a. Let x=0 correspond to 2000 and x = 20 correspond to 2020. Find values for C and a so that f(x) = Cax models the data. b. Estimate the CFC 12 concentration in 2013. a. C= a≈ (Simplify your answer. Round to the nearest hundredth as needed)

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