how do i do this on a ti-83 plus calculator?

[imported_K3N]

http://upload.wikimedia.org/math/2/2/d/22d510a23d2dc8e9cdfead05878785ba.png

ignore the 4, please i would greatly appreciate if someone told me how..

 

[thesurge]

log_a(b)=log(b)/log(a)

 

[BrownTown]

yep, thats what i always do

EDIT: like in formulas when you see 2.303*STUFF that is converting from base 10 to a natural log.

 

[imported_K3N]

So in this case it is Log(81)/Log(3) , if so thanks