<p>
I think you could use Ti-89 on SAT I but not ACT. See above post #6, [Calculator</a> Policy](<a href=“The SAT – SAT Suite | College Board”>SAT Calculator Policy – SAT Suite | College Board), and [Frequently</a> Asked Questions | Can I use a calculator? | ACT Student](<a href=“ACT Registration | ACT Testing Dates | The ACT Test”>ACT Registration | ACT Testing Dates | The ACT Test)</p>