Answer:
c
Step-by-step explanation:
This shape is made from a four sided shape which is 360°
and a three sided shape which is 180°
so the combined interior degrees is 540°
so
3x + 6x+ 1 + 2x + 4x + 5x-1 = 540
20x = 540 combine like terms
/20 /20
x = 27
