Answer:

Step-by-step explanation:
Using the rule of exponents
=
, then
=
= 
The answer is 12 because 5+7=12
2r+6r=27
8r=27
*divide both side by 8
r=3.75
I believe your answer should be 8, I am sorry if I am wrong, please mark mine with a low star rating if I am false
Answer:
PERIMETER=Y+2Y+11+-3Y-9+Y^2+5Y-1+6Y^2
=7Y^2+4Y+1