This 3 minute narrated and animated PowerPoint on Parabolas Min or Max works great as a bell ringer activity that still covers a Common Core (CCSS) High School Algebra topic HSF-IF.C.7a on quadratic functions minima and maxima. It should run automatically giving the teacher 3 minutes to take attendance or prepare for class. There is an exit problem with a parabola y = x^2 -3 as the answer. This would work well for summer school, substitute teachers, and homeschoolers.
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