I'm not really 13, but don't have an account anyways. It's good because it has a large user base and well does some things okay. It can do most level 1 calculus things. Don't expect it to go farther than the high school level. Although it seems crappy (kinda of is comparted to ti-89 T) and a little to expensive, (it kinda is), it does its job well and has plenty of user made games and programs that excel the functionality of this calculator. This guide lasted me 6 years, well until the battery spring crapped up. I dropped in dozens of times on hard concrete and accidentally kciked it while picking it up and does fine. So anyways here are some key functions:
2-d graphing, numerical integration, summations, numerical derivatives, calculates slope, area under a cure graphically, BASIC programming editor, all functions found of scientific calcs, Matrices, linking, applications, some other stuff, Lists, just a lot of stuff, solver, polynomials.
Downloadable: 3-d graphing, calculation of pi to thousand digits or so, grayscale games, world map, symbolic differentiation, formulas, etc. and sound files.
This is not a really powerful calc, if you want something that will last you, I suggest a ti-84 + SE. It's 2.5x faster, 9x the memory, has a clock, looks cooler, (bad key contrast though), nice screen, usb connectivity, just a bunch of cool stuff.Get more detail about Texas Instruments TI-83 Plus Graphing Calculator.
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