Just give the answer plz 0_o

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

To decrease an amount by 16% what single multiplier would you use

Triangles abd and ace are similar right triangles. witch ratio best explains why the slope of ab is the same as the slope of ac?