<p>yeah, 89's are good, but dont' use it the whole test, you'll run out of time! it takes a while to punch in a big equation...</p>
<p>but it takes longer to solve it by hand.</p>
<p>I think if you start taking a lot of practice tests using the calculator and becoming familiar with it, you'll be able to solve questions really fast and that beats writing it out and doing it the traditional way.</p>
<p>Can someone expand on that define f(x) idea? How do you define a function? what can you do with it? (composition, inverse, what other uses?)</p>