Consider the function $f(x)=-7(x-5{)}^{\frac{2}{3}}.$ For this function there are two important open intervals: $(-,A)$ and $(A,)$ where $A$ is a critical number.

Find $A$

For each of the following intervals, tell whether $f(x)$ is increasing or decreasing.

$(-,A)$ : Select an answer $vv$

$(A,)$ : Select an answer