A data set that appears exponential is modeled by the function 𝑓. When the data are represented using a semi-log plot, where the vertical axis is scaled using a base 3 logarithm, a linear pattern is apparent. The linear model corresponding with the semi-log plot has equation 𝑦=2𝑥+1. Find an expression for 𝑓 in the form 𝑓𝑥=𝑎𝑏𝑥