Answer:
B. 85
Step-by-step explanation:
I haven't taken Geometry in 2 years So I don't remember how to explain it.
180(6 - 2) = 720
4x + 180 = 720
4x = 630
x = 157.5
S = 720
X = 157.5
m=9
11-9m=-70
-11 -11
-9m = -81
divide both sides by -9 and you get m=9
