What is the difference 1/9 - 5/6 a 13/18 b 1/18 c - 1/18 d -13/18

Which representation has a constant of variation of -2.5

Ineed to know the answer to this algebra question.

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat