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Originally Posted by Eugenia Gabrielov
TI-89: A phenomenal machine. Not acceptable on ACTs, highschool kids. I personally recommend starting on a TI-83 or a TI-84 before you delve into 89, because it's an incredibly powerful calculator with some stuff that is more user-friendly, but other stuff that's more complicated. High on my recommendation list.
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It's a really useful calculator... but most college professors won't allow you to use them on an exam (assuming they allow you to use calculators at all).
I use a -89, -83, and an old HP 12c calculator (for some reason, RPN has grown on me for simple math)