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)= 15(1.04)^n

Question

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)= 15(1.04)^n

anonymous · Answer

n represents the day... 
20.53 is not the day, its the height

anonymous · Answer

you may rephrase it a bit and put something like below :
Since the scientist starts studying on day 0, the lowest value for n is 0.
 The scientist concluded the study when the plant reached a height of 20.53cm which happens when n is approximately 8. So the domain to plot the growth function is :  0≤n≤8

anonymous · Answer

you should get 0.6625