The calculator is fine for school use, up through college as long as you're not majoring in math, physics, or something that motivates a top level device (such as the HP4* or TI89). One major benefit with the 83+ is that it's so common that most teachers know how to use it, many classmates will too, and there is tons of apps and info about it online.
However, this isn't really why I'm writing here. I want you all to take a good look at many of the reviews. Especially the five-star ones that say "this is the only calculator you'll ever need!!!", "buy now before it gets too expensive!!", "the Ti83+ is everything you'll ever need and more!!" Notice how they are all from anonymous posters, correctly spelled (a dead giveaway) and well articulated? I swear it breaks my heart that these type of reviews from "users" can't be trusted anymore. It's a fact that resellers and manufacturers actually pay people to write up their products on web boards and commerce sites such as Amazon.
Don't trust the ratings or the reviews here. For a proper evaluation, look at the technical magazines that review gadgets, and talk to teachers and classmates instead.Get more detail about Texas Instruments TI-83 Plus Graphing Calculator.
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