Simplify $\left(3^{*.18}\right)^{-4}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $*.18$ and $n$ equals $-4$

Simplify $\left(72^{2.625}\right)^2$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $2.625$ and $n$ equals $2$

Wenden Sie die Formel an: $ab$$=ab$, wobei $ab=2.625\cdot 2$, $a=\frac{21}{8}$ und $b=2$