I had to give back a loaned TI-83+ in June, and I purchased a TI-89 to replace it. I've figured out how to do most things, except these two which are really annoying me:<BR><BR>1. Cubic and higher ...

I'm going into my masters in Statistics/Industrial Engineering, which calculator will be better for me? I have had a TI-89 before, and before that a TI-85 and TI-81 so I am comfortable with them, but ...