Answer:
These should be right hopefully! Hope it helps!
Triangle,quadrilateral,pentagon,hexagon,octagon,decagon.
Triangle quadrilateral octagon - regular
rest are not. Someone might need to check me if im right about regular and irregular :) Hope I helped
1280, -2560, 5120
Multiply the preceding term by -2 and
I believe it is commutative property cause the numbers didn't change instead they just switched places in the equation.