Quadratic Equation Parabola Slider

This applet allows you to change a, b, and c values in a quadratic equation and view the results.
1. How does changing the a value affect the parabola? Is this what you expected? 2. How does changing the b value affect the parabola? Is this what you expected? 3. How does changing the c value affect the parabola? Is this what you expected?