I'm pretty sure that you need to multiply pie times the radius of the circle
Answer: y=16
explanation: y=128 when x=512, so to get the value of y, you need to divide 512/64=8. dividing 512(x) by 8 times gets 64, so you need to divide 8 on the other side(y). 128/8=16. hope this helped!
I am currently dong the same thing, if you go to symbolab.com then im pretty sure you'll be helped. ;)
Answer:
7²
Step-by-step explanation:
3*2=6 6/2=3 6-2=4 4*2=8 8/2=4 4+3=7
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)