A the first answer because the triangles are the same they are just flipped
You do inverse op
2.7+23.5=26.2
You need to know the area if you're going to
1st selection: cover the surface of the dartboard.
The greatest common factor of the expressions 60x and 84 is 12 because it can divide both 60 and 84 giving us the answer of 5 and 7, respectively. Factoring out 12 from the terms of the given expression will give us the answer of,
60x - 84 = 12(5x - 7)