Algebra - Introduction to Functions (Identifying and Evaluating Basics) 10 pages practice work + 10 pages of detailed answer keys. May be used as class work, centers work, homework, remediation work, and paired work. Page 1 - Introduction of Functions Using Football Players as Domain and Teams as a Range. Page 2 - Vocabulary of Functions & Review of Functions and Non-Functions with Practice. Page 3 - Vertical Line Test for Functions with Examples then Practice. Page 4 - Practice Identifying Fu