undefined
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Null and Undefined in Javascript. What's the difference between null and…, by Megan Lo, Webtips
Do your students get confused about whether an answer is zero or undefined? Here is a visual mnemonic to help students remember the difference.

Math Poster - Slope - Zero vs. Undefined

Null and Undefined in Javascript. What's the difference between null and…, by Megan Lo, Webtips

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Queer Undefined

The Definition of Undefined

Definition--Slope Concepts--Undefined Slope
Zero, empty, null and undefined in JavaScript, Python, Ruby, and PHP.

Undefined slope - MathBootCamps
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