Here, in the first screencast, a polynomial-of-best-fit (of degree 5) was generated by plotting points and creating a best-fit model [url=https://www.geogebra.org/m/RKYFdQJy#material/bjnctmqr]as further demonstrated in this previous resource[/url]. [br][br]In the second screencast, 2 different surface equations were used. [br][br][b]Questions to consider: [/b][br][br]How would you describe these surfaces? What exactly are they? [br]What could we do differently to improve this 3d model? [br]How do the equations mathematically ensure the 2 surfaces do not overlap?