The property illustrated is the Commutative Property
I did this in school!!
You can do it 4 times.
I think...
Your welcome!
Answer:
B, C
Step-by-step explanation:
that's the answerrr
So.... notice the picture below
now, we know what the "height" or "altitude" is
now, we also know the perimeter is 18cm
so, k + k + b = 18
or 2k + b = 18
thus

so... one can say that

and you can simplify it if you wish.. not sure you have to