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When Cake is 20, Pie is 5

The arbitrariness of variable names.   When cake is 20, pie is 5. When cake is 100, pie is 85. So pie = cake – 15, or p = c -15. The students named these variables, figured out the rule, and created the equation after we had first done a traditional function machine and then discarded the conventional language (‘”in,out”…

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