## Calculus 8th Edition

(a) An exponential function could be chosen as the model for this data since the data approximately fits the shape of an exponential function such as $2^x$(ie. increasing). (b) A rational function could be chosen as the model for this data since it seems to have "asymptotes" in the same way that a rational function like $\frac{1}{x}$, for example, does and thus a rational function would be an approximate fit.