My brother needs help

The answer to the question is 5.27

Well if you’ve already proven it, all i can give you is tips. in a paragraph proof just remember to use words like therefore, because, and since to bridge the gap between a statement and it’s reason in a paragraph proof.

  example you can find the perimeter by addig all of its respective sides as such: (12+x)+(12+x)+(7+y)+(7+y).  adding like terms will result in   2x+2y+38    if you chose  xy+7x+12y+84, you multiplied the two sides to find the area.  if you chose  x+y+19