This hyperbola is centered at the origin. Find its equation.
Foci: (0,-9) and (0,9)
Vertices: (0,-7) and (0,7)

The change in water level of a lake is modeled by a polynomial function, w(x). described how to find the x-intercepts of w(x) and how to construct a rough graph of w(x) so that the parks department can predict when there will be no chage in the water level. you may create a sample polynomial of degree 3 or higher to use in your explanations.