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Unit one is about the descriptive, not the quantitative. This unit is about seeing relationships between variables in different ways, recognizing that there is a special kind of relationship we call a function, and understanding properties that are special to functions of all different types. The unit studies relationships between different variables and how to represent these in a variety of different ways  especially with graphs and tables (equations are not emphasized until Unit 2). We also introduce unit conversions repeatedly during the the unit so that students come to see converting units as foundational to understanding relationships between different quantities. 
Time frame: 5 weeks 
Initial Task  Developmental Lessons  Closure & Assessment 

1 lesson  4 weeks (approximately 1 week per big idea)  1 week 

Formative Assessment Lesson: Reengagement: Final Task: 