have you tried referring to the back of your textbook lots of them have eoc type questions in the back and I'm sure there are online pfds of algebraic eco practices
B
The sum of Interior Angles is 180 degrees
It's 42 because 2 times 42 is 84. Then 2 times 8 is 16 so take 84 - 16 is 68
This is a 52% increase.
The answer and the work is attached in the image provided.