Quadratic Explorations

This is the graph of y=ax²+bx+c. Point A is at the vertex. Vary the sliders for each parameter to change the graph. Determine how each coefficient changes the graph of the parabola.
How does the value of a change the graph of the parabola? Be specific. How does the value of b change the graph of the parabola? Be specific. How does the value of c change the graph of the parabola? Be specific.