There is a formula for Sum of interior angles of a polygon:

This figure has 7 sides, n = 7

Add up all the given angles,
Subtract from 900,
This will give you value of x.
The greatest common factor for 5 and 10 is 5
I believe the answer is b because u need to combine like terms and 6c+2c+5c is 13c.
Answer:
Answer is 50cc Number D
Step-by-step explanation: