13.
[tex]-3^{12}=-((3^3)^4)=-(27^4)=-27^4\\(-3)^{12}=3^{12}=(3^3)^{4}=27^4\\3^{12}=27^4\\-9^{11}=-((3^2)^{11})=-3^{22}\\(-9)^{11}=-9^{11}=-3^{22}\\-9^6=-(9^6)=-((3^2)^6)=-3^{12}\\(-9)^6=9^6=3^{12}[/tex]
[tex](-3)^{12}=3^{12}=27^4\\\\-9^{11}=(-9)^{11}=-3^{22}[/tex]
