Aaron and Davis need to write the equation that will produce the graph at right. Aaron: This

Question:

Aaron and Davis need to write the equation that will produce the graph at right.
Aaron: "This is impossible! How are we supposed to know if the parent function is a parabola or a semicircle? If we don't know the parent function, there is no way to write the equation."
Davis: "Don't panic yet. I am sure we can determine its parent function if we study the graph carefully."
Do you agree with Davis? Explain completely and, if possible, write the equation of the graph.