SanfordFlipMath PreCalculus 8.4 and a Half--Conics Mixed and Backwards

By request: An example of each type (P,H,C,E) going from the "stuff" to the equation. Some discussion of related issues is with each of the four examples. (Some of the examples are from Precalculus: Functions and Graphs 4th Edition, Demana, Waits, Foley, Kennedy)