Not sure if I'm right but I believe they intersect at (1,4).
$5000 I think should be right
I think 517.26
I did 10 times 3^2 (9) it equals 90. Then 90 times 3.14 and got 282.74. Then did 800- 282.74 and got 517.26
So area is base x height:
5(x+2)=20
5x+10=20
5x=10
x=2
its A