Answer:
Fourth choice: - Domain: All real numbers ; Range {y | y > 0}
Explanation:
The domain of the function is the set of x values for which y is defined.
The range of the function is the set of y value that y can take.
Now for our function
[tex]y=\frac{1}{9}\cdot4^x[/tex]x can take any real value; it is defined for both positive
