What type of solution do you get if you solve an equation and the last like says 12 = 12

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

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score