Alexa completed her rational equations, and answered the questions correctly. I introduced Exponential Functions to her. A linear function has a constant rate of change and is a straight line. A quadratic function has a variable raised to the second power, and its graph is a parabola. An exponential function increases exponentially, and either shows growth or decay. I showed Alexa a chart of different functions, and she was able to see that the exponential functions start off increasing slowly, but then start to rapidly increase. An asymptote of the graph is the line that the graph gets closer and closer to but never touches or crosses.