Asap 100pts part a and part b

a scientist 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) = 10(1.02)n

part a: when the scientist concluded his study, the height of the plant was approximately 11.04 cm. what is a reasonable domain to plot the growth function?

part b: what is the average rate of change of the function f(n) from n = 1 to n = 5, and what does it represent?