2827.43 is the correct area of the park:)
EDIT:
Order of operations doesn't matter in addition. So you can add them in any order.
9f-11-(14f+4)=0
9f-14f-4-11=0
add all the numbers together, and all the variables
-5f-15=0
We move all terms containing f to the left, all other terms to the right
-5f=15
f=15/-5
f=-3
The answer to this one is<em> xy + 4</em>
6 divided by 
is the same as 6/1 multiplied by 9/8, which gives us 7 as the whole answer. therefore, I think number 1 and 4 are the correct selections
