When multiplying out you get:
x2+4x-3x-12....
so you'd be adding the +4x to the -3x
x2 + x - 12
Answer:
900°
Step-by-step explanation:
Sum of angles= 180(n-2)
Where n= number of sides of polygon.

93.5 + 8.7 = 102.2
Hope this helps! :)
Answer:
72
Step-by-step explanation:
im pretty sure you just have to do 18*4