Answer:
a=14
Step-by-step explanation:
-a+28=14
So -a=-14
so a=14
9+6(2^2+4)
9+6(4+4)
9+(6)(8)
9+48
=57
Answer:
that can help because all you need to remember is that the sum of the angles in a triangle is half of the sum of the angles that add up in a quadrilateral.