Pls help help help help​

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

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

This is so hard and it’s for a test