express it its lowest terms the ratio of 6 to 9:of 12x to 16y:of am to bm:of 20ab to 10bc: of m+n to 2 2

m -n.

6/9 = 2/3

12x/16y = 3x/4y

am/bm = a/b

20ab/10bc = 2a/c

The way you have it written, I don't understand the last one. I hope you see the principle to do it yourself.