I'm goin to keep this short. Basically if your in high school, this calculator is more than you need. Im in college algebra in 10th grade and I'm not allowed to use it in class. The TI-89 contains a computer algebra system where you don't have to do any of the work. You just press the "solve(" key, type in the problem then ",x" or whatever other variable your working with and it does the whole problem for you. This is the same as cheating because it doesn't show the work just gives the answer. That's why its not allowed in most high school math classes. Also, the TI-89 is not allowed on the ACT so don't just buy it so you can cheat to get a good score. Ok i'm bein a little unfair. The TI-89 is an excellent calculator, one of the best i've ever seen. I just recommend it for 12th grade and up.