I believe that it is E since it is pretty obvious where the middle is you just do rise/run which gives you 2,-1
Sorry but im terrible at math
I'm assuming all of (x^2+9) is in the denominator. If that assumption is correct, then,
One possible answer is 
Another possible answer is 
There are many ways to do this. The idea is that when we have f( g(x) ), we basically replace every x in f(x) with g(x)
So in the first example above, we would have

In that third step, g(x) was replaced with x^2+9 since g(x) = x^2+9.
Similar steps will happen with the second example as well (when g(x) = x^2)
Answer:
105/8 inch^3
Step-by-step explanation:
7/2*5/2*/3/2 = 105/8