The final 8 lesson unit in the text concentrates on higher level modeling and function concepts. It begins by exploring all major function transformations in all function forms. Discrete, linear, exponential, step, and piecewise functions are all reviewed and extended in this unit. Quadratic modeling is explored. Finally, the limits on the accuracy of model outputs is discussed.To access the lesson videos on YouTube use your smartphone or tablet to scan the QR code at the top of each lesson.