Which is the simplified form of the expression ((2^-3)(x^-3)(y^2) / (4^-2)(x^4)(y^6))^2

Ineed asap.i cant understand this question i need someone to me right away

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.