It can be modeled by an exponential function, f(x) is divided by 3 each time x increases by 1.
This means that the base of the exponential function is 1/3, and since the value of f(x) when x=0 is 81, 
I would say A. I'm assuming this is to do with the equation y=kx, therefore A has the k value of -12
Answer:
use the division to see the the size of he pool it is 6.3
Step-by-step explanation: