Answer:
1.75
Step-by-step explanation:
Good luck hope it's right
<span>x + 9 = 2(x - 1)^2
x + 9 = 2(x^2 - 2x + 1)
x + 9 = 2x^2 - 4x + 2
</span>2x^2 - 4x + 2 - x - 9 = 0
2x^2 - 5x -7 =0
The sum of a polygon's angles are 540.
When you add all the angles together here, you get 456.
Now subtract 456 from 540.
540 - 456 = 84
If we are talking about degrees they should equal 180
Answer:
1st is valid 2nd is not valid
Step-by-step explanation:
