Ext3 users - Feb 2002 - gnu parted

hello.  
I have ICP Vortex Raid Controller
with 6 18 gigs seagate drives.
I have setup 4 of them for RAID 4.
there after, i added the other 2 drives
to expand the RAID.  now i need to use
gnu parted to make my partition /dev/sda7
from 43gigs to 83gigs.  

how would i tell gnu parted to do this ?

looking at the man and the interactive
mode.  

(parted) resize MINOR START END

the MINOR would be 7
START ??
END   ??

how do i get the START and END MEGABYTES