Question about Texas Instruments TI-84 Plus Calculator
This typically means that something you're inputted didn't follow what the calculator expected for a given input. This can happen if you put something in like "6++5" -- the calculator doesn't expect another function sign after "+", it expects something that has numerical value like a variable or an actual number! You can fix this by hitting  on the error screen, which will take you to the place where the calculator stumbled on the problem. From there, you can doublecheck what you typed in and try it again.
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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