Answer:
Explanation:
This follows the form

where a is the initial value and b is the base with the exponent. Using that information, we can see that the initial value in our function is 1/3. Simplifying the base will take some work. Let's first rewrite this is a radical:
![81^{(3x)/(4) }=\sqrt[4]{81^(3x) }](https://img.qammunity.org/2021/formulas/mathematics/high-school/xfwt8tyf1szctivo39gx1fvgkmif8jj16t.png)
Now let's break up 81 into its factors. 81 is 9*9 which is 3*3*3*3. Therefore,

We will use that as a simplification:
which simplifies to
![\sqrt[4]{3^(12x)}](https://img.qammunity.org/2021/formulas/mathematics/high-school/qqgfc6ah9wf6hb5vewm3mhm88khj3hupr9.png)
Rewriting that as an exponent looks like this:
which simplifies to

That's the answer for the second part. The whole exponential equation now is

The domain for an exponential function is all real numbers and the range is
y > 0