Can i transfer my pictures from the gallery on my tablet to a flash drive

Yes, but it takes several steps to transfer pics from your tablet to a flash drive.

There are two ways of accessing tablet files: 1) wireless access which requires a sync app on your tablet and PC software of the same app type. One such app for sync between Android (any) to/from PC software is Cheetah Sync: http://www.jrtstudio.com/cheetah-sync-android-wireless-sync.

Alternatively, you can use ES File Explorer's Network/LAN/Cloud/FTP functions to share files between your Android phone/tablet and your PC via secure Wifi: http://www.cnet.com/how-to/share-files-between-android-and-windows-with-es-file-explorer/

or 2) wired via the USB charging cable, which I will explain in more detail:

Plug your table to your PC using the Samsung charger cable that doubles as a data transfer cable when you remove the USB plug from the wall charger cube and plug it to the USB port on your PC.
Your PC should read your tablet as an external drive: Open "My Computer" and double-click the tablet drive icon>search your subfolders for your pictures. Highlight your picture files and either copy and paste or drag and drop (different way of copy/paste) to your desktop (or desired location), copies will be transferred but not moved from the tablet unless you "cut and paste" from your table to PC to clear out your tablet and make more space. When done, unplug your tablet cable from the PC. Plug in your flash drive to the available USB port: access the flash drive icon on My Computer. Drag and drop or copy and paste picture files to your flash drive.