Make drawing (see attachment)
do big rectangle minus triangle
big rectangle area=lenght timess width=22 times 33=726 square feet
triangle=1/2 times base times height=1/2 times 9 times 10=45 square feet
rectangle-triangle=726-45=681 square feet
The area is 15 14/64 which simplifies to 15 4/14 becuse you multiply width times length
A + (b + c) = (a + b) + c.....what u have here is the associative property of addition
If you plug in 12 for x.
Your expression is y= 2(12)/3y
then you just solve for Y