Answer:
6*2ⁿ
Step-by-step explanation:
[tex]z^{x+y}=z^x*z^y\\2^{n-1}=2^n*2^{-1}\\2^{-1}=\frac{1}{2}\\12*\frac{1}{2}*2^n\\6*2^n[/tex]
