Honestly, I have no idea what it means by decomposition, but this is my best bet on what it means: Dividing the polygon into smaller, easier sections and solve for area and add them up.
Answer:

Step-by-step explanation:
we know that
The formula to calculate the coordinates of the midpoint between two points is equal to

we have that
The coordinates of hk

substitute in the formula to calculate the midpoint



5p-9=2p+12
+9 +9
5p= 2p+21
-2p -2p
3p/3=21/3
p=7
Answer:27
Step-by-step explanation:
3 x 3 x 3