Πέτρος Χέρας
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love the "notice and wonder" approach!  Summation notation

Summation Notation also known as Sigma Notation. A simple way of expressing the sum of the values of a sequence. This is seen in PreCalculus, Calculus 1 (AP Calc AB), and Calculus 2 (AP Calc BC).

Funny

When the teacher is watching you during a test.and you pretend that you're at least trying to think.yah but I'm doing that pose with my middle finger instead hehehe