For this case we have the following exponential function:
[tex]f(x)= \frac{1}{7}(9)^x [/tex]
The first thing you should see for this case is the behavior of the function when you substitute values of x.
When replacing positive values (very large) the function tends to infinity because it is an exponential function.
When substituting negative values (very large) the function tends to zero because it is an exponential function.
Therefore, the range of the function is:
(0, ∞)
Equivalently:
y > 0
Answer:
all real numbers greater than 0
