Investigating exponential functions

Using the slider, set a=1. Questions: Explain what happens as you change the values of using the slider? What remains the same, what doesn't? Why? Now let be other values besides 1. What kind of changes take place now? For most s and s, there is a long, flat tail on the left side of the graph. What is the tail called? How can we move it to be somewhere other than just the x-axis?