Add all of the interior angles to 1260. Then you simplify for x. After that you plug in what you found for X in the E expression.
This is the symmetric property, for you divide 9 to both sides to get x, instead of adding (addition property of equality)
So symmetric property should be your answer
Hope this helps
Answer:
2458
Step-by-step explanation:
A
Mark brainliest please mark
Hope this helps you
