I need help please.

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

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%