I have a mac osx it is 10.7. my audacity is 2.0. How do i open an Audacity file in garageband??
You don’t. Audacity projects (AUP) are only for Audacity.
To use your work in GarageBand, use File > Export… and choose AIFF 16-bit or WAV 16-bit.
See
http://manual.audacityteam.org/o/man/audacity_projects.html
Audacity Manual .
Gale