<p>I’ll keep the rant shorter than intended: 89 is a powerhouse that has potential to rip apart AP and SAT questions… And it will certainly kill the math level 2 exam. (AKA solve this trigonometric equation and give me an exact answer using the calculator function por favor). Best to learn before getting an 84 to be proficient at it~and the lower the math course such as Algebra, the more you’ll know how to abuse the heck out of it :)</p>
<p>Being lucky, your college professors / high school teachers may or may not allow them if they know the capabilities. And this sort of helped me clench a borderline A this semester with it doing really long / complicated partial fraction decomposition, laplace transforms, or solving DEs to check answers.</p>
<p>The really short: Ti-84 is certainly enough (actually confusing to me!). But Ti-89 is far better :P</p>