Factor out 3^2 ^3−18^2 ^4

Which composition of similarity transformations maps polygon abcd to polygon a'b'c'd'? a dilation with a scale factor less than 1 and then a reflection a dilation with a scale factor less than 1 and then a translation a dilation with a scale factor greater than 1 and then a reflection a dilation with a scale factor greater than 1 and then a translation

How do i put 3(x+7) in distributive property

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25