Answer:
The graph in the attached figure
Step-by-step explanation:
we have
[tex]f(x)=18(0.8^{x})[/tex]
This is a exponential function of the form
[tex]f(x)=a(b^{x})[/tex]
where
a is the initial value (the y-intercept of the function)
b is the base
r is the rate
b=1+r
In this problem we have
a=18
b=0.8
r=0.8-1=-0.2=-20% is a decay function
using a graphing tool
The graph in the attached figure
