Answer:
The area and the perimeter of the square barn which has each side 9 meters long is 81 m² and 36 m.
Step-by-step explanation:
Answer:

Step-by-step explanation:
We want to find
.
can be written as
, so we can now write our original equation as:
.
We can combine like terms: 
Hope this helps!
Its faster in adding isn't always right when you are multiplying numbers