how is the quadratic r model derived what is vvar 1 what is the r language used for what language do we use to make models what is the function r what is r var how to make a quadratic model what is the var of a poly function for r what is the function poly in r what function do quadratic models use what does r mean on poly when poly functions are used for r what is var1 in r what are the quadratic models for r and p what is the poly function in r how to model a quadratic equation what is the r language what functions do quadratic models have what is the r-language var1 what is the range of poly functions and i functions in r