Question

How do you determine if the equation `y= 0.5 (0.9)^x` represents exponential growth or decay?

Answer 1

Anything to the `x` will be growth, if it's `n^(color(red)-x)` then it'll be decay.

Explanation:

`n^(-x) = 1/n^x`

Therefore as `x` increases, `y` will decrease.

When you have `n^x` as `x` increases so will `y`.