In this super secret number puzzle, students work with equations of tangent lines. Students need to know how to find the equation of a tangent line, the equation of a normal line, and how to find where a function has a horizontal tangent line.
Students find the answers to each of the eight questions and then add and subtract their answers as indicated – the result of these calculations is the super secret number. After a bit of time, I tell them what the super secret number should be. If their super secret number matches mine, they probably did their problems correctly.
As an alternative, I have also included a page with a QR Code. This QR Code leads to the super secret number. To add excitement, students can scan the QR Code instead of just having the teacher tell the class the Super Secret Number.
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