1. The problem asks for the equation of the axis of symmetry of a parabola. 2. The graph shows a parabola opening downwards with its vertex at approximately (0, 5). 3. The axis of symmetry of a parabola is always a vertical line that passes through the vertex's x-coordinate. 4. Since the vertex is at (0, 5), the axis of symmetry is the vertical line $x = 0$. 5. Therefore, the equation of the axis of symmetry is: $$x = 0$$ This line divides the parabola into two mirror-image halves.