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Solution 32831: Deleting NoteFolio™ Files on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.

...are not archived. Files that are NOT archived will be deleted immediately upon pressing [DEL], while archived files will prompt the user to confirm whether they want to delete the file by either choosing yes or no. Please see the TI-Notefolio guidebook for additional information. Solution 32831:...
https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/32831

Solution 12192: Graph of Certain Functions in Polar Mode Displays Negative Values on TI Graphing Calculators.

...at r must be positive. The reason is that calculus deals with real-life type situations. In the real world, it doesn't make much sense to say that something has negative radius, so the negative radius is usually converted to a positive (which affects the q value). For example, the point (-(2), -p...
https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/12192