<p>^That’s true. That’s why I told the OP that he/she may have difficulty finding a person that knows how to use those calculators if he/she needs help. However, the 84 Plus doesn’t have features that are available on the HP–primarily a CAS. Because the OP may have trouble getting the 84 Plus, he/she probably won’t be able to afford a TI-89, the cheapest TI with a CAS. That’s why I would recommend the HP calculator; it shouldn’t be too hard to figure out, right?</p>