multiplicative inverse of 1 plus i is 1 minus i
No. I believe TI83+ and TI84 do use an operating system.
Yes. The TI83 has several applications that can be downloaded onto the TI83, mainly those made by Texas Instruments. Also, you can write your own software.
the inverse of x+3
It depends on whether you mean additive inverse or multiplicative inverse.
The additive inverse is x5 + 2x - 2.
The inverse of a number is 1 divided by that number. So the inverse of x3 + 1 is 1/(x3 + 1).
There are online graphing calculators. However, as of writing, there is no emulated TI83 that runs within your browser. On the other hand, if you have a Ti83, it is possible to copy its ROM to run an emulated TI83 on your desktop via one of many emulators.
The multiplicative inverse of 3+2x is 1/(3+2x).
No, f(x) is not the inverse of f(x).
No, it really depends on the college. Some colleges don't allow any calculators for their math classes. Everything that can be done on a TI83 can be done with the human brain, so some professors make tests with easier computations so that you don't have to use a TI83
4.7 (or PLUS 4.7)