Answer:
The answer is c.
A parallelogram will have two sets of angles the same.
So in fact this parallelogram will be 30+5x + 30+5x +15+10x +15+ 10x =360 because we know angles inside a parallelogram total 360.
We can add together like terms.
So we end up with 90 + 30x = 360.
We can remove 90 from both sides, giving us 30x=270.
Then we divide both sides by 30 which gives us x =9.
