I need help what do I have to do plz if you don’t know the answer don’t write nothing thank you

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Need ! give step by step solutions on how to solve number one [tex]\frac{9-2\sqrt{3} }{12+\sqrt{3} }[/tex] number two [tex]x+4=\sqrt{13x-20}[/tex] number three (domain and range) [tex]f(x)=2\sqrt[3]{x} +1[/tex]

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?