I think, not 100% sure, but I think it is square root (A/4pi)=r
Answer:the answer is 14
Step-by-step explanation: first you want to multiply
8*6.5
=52
then, since you want to get x being what it takes to get to 728 you divide
728/52
14
hope this helps
Goog luck!
y = a ( x - h)^2 + v
a is positive when the parabola opens up and negative when it opens down.
