The figures present two families of quadratic functions. In each family the coefficients are varied in a[br] systematic way. In each family the graphs have a common axis of symmetry.[br][list][*]Learn the properties of each family.[/*][*]Investigate other families of functions that are formed by changing the coefficients. [/*][*]Find other examples of families in which all the functions have a common axis of symmetry. [/*][*]Which of the phenomena can you explain?[/*][*]Describe conclusions, conjectures, and questions that arose. [/*][/list][br][br]