a biologist is studying the growth of a particular species of algae. she writes the following equation to show the radius of the algae, f(d), in mm, after d days: f(d)=9(1.04)^d part A: when the biologist concluded her study, the readies of the algae was approximately 12.81 mm. what is a reasonable domain to plot the growth function? part B: when does the y-int of the graph of the function f(d) represent? part C: what is the average rate of change of the function f(d) from d=3 to d=9, and what does it represent?