All the angles should add up to 360°.
8x+10x+9+21x-12+90=360°
Group like terms together.
So,8x+10x+21x+9+90-12=360
39x+87=360
39x=360-87
39x=273
x=7
Answer:
-24
Step-by-step explanation:
You are just counting by two's.
not enough to figure out :/
The answer is: 4y(2x+y)
The answer is below.
