Section 2.6 Topics:
    Constructing functions with variation;
        Direct variation;
        Inverse variation;
        Joint variation;
        Combined variation;
        Examples. 

Section 3.1 Topics:

    Quadratic functions and inequalities:
        Two forms for quadratic functions;
        Opening, vertex and axis of symmetry;
        Intercepts;
        Quadratic inequalities;
        Applications of maximum and minimum;
        Examples.