A^3=5 b^3=4 Find value of (ab^2)^-3

I seem to get 400 every time.
(ab)^(2*-3)= ab^-6 = -5*-5*-4*-4=400

Marya wants to factor the polynomial 36x^3 -22x^2 - 144x. which term can she add to the polynomial that would not change its grestest common factor? check all that apply

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?