On the TI-89 (I'm assuming there is a way, just I'm not seeing it, and didn't catch any mention of it in the manual), is there any way to do a root other than square root of a number (not sure exactly what they are called, but you know, where you have a small number on the outside of the radical sign, like if it were a 3, and the number inside was 64, the answer would be 4)? Thanks.