Lesson plan

Make informed decisions by analyzing and comparing functions represented in at least two different ways

teaches Common Core State Standards CCSS.Math.Content.HSF-IF.C.9 http://corestandards.org/Math/Content/HSF/IF/C/9
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Big Ideas: Functions can be represented in different ways (algebraically, graphically, numerically). Functions can be solved algebraically by identifying ordered pairs, completing a table, or making a graph. Ordered pairs, tables, and graphs provide solutions to functions. Students will compare functions written in different formats and will make decisions based on those comparisons. The task will require students to organize cell phone plan information to assist a student's grandparents in determining which plan is best for them. Without being told the grandparents' average monthly minutes-used, the explanation will require specifying when the different plans become a better bargain. Functions will be a fundamental concept in algebra and future high school math courses. NOTE: Function notation is addressed in later lessons. Vocabulary: function, dependent, independent, ordered pair Special Materials: graph paper