Ascientist is studying the growth of a particular species of plant. he writes the following equation to show the height of the plant f(n), in cm, after n days: . f(n) = 15(1.04)n. part a: when the scientist concluded his study, the height of the plant was approximately 20.53 cm. what is a reasonable domain to plot the growth function? . part b: what does the y-intercept of the graph of the function f(n) represent? . part c: what is the average rate of change of the function f(n) from n = 1 to n = 5, and what does it represent?