Answer:
$484.92
Explanation:
Since you have 4 sides to the pen you will need to figure out how many yard total there is so two of your sides are 9 yards and the other two are 18 yards. now you have to add however many yards there are....
9+9=18
18+18=36
then you have to add those two numbers together
18+36=54 yards total
now you just multiply 54 by 8.98
your total amount of money you spent is $484.92