Answer:

Step-by-step explanation:
You can see the attached picture
Answer:
2x +3x =7-13=4+8
Step-by-step explanation:
5x= -6= 12
Answer: D.
Step-by-step explanation:
X+6
The sum of the inner angles of a polygon with n sides is 
Since your polygon has 6 sides, the sum of its inner angles has to be

On the other hand, the sum of its inner angles is

And it has to be 720, so we have
