Arrange these numbers from least to greatest.
5/6 7/9 -4/5

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.