Those are all system apps, they reside in system protected space like /system/app and that space is not usable even cleared... These system apps store their data in usable space, which would be regained but only minimally. There is no uninstall option because they reside in the system partition and are part of the firmware.thanks for your reply and the warning.
I think maybe I've misunderstood something because in the past ive been able to go to: settings, storage and usb, internal storage, apps. and then when I tap some of the pre installed apps (or bloatware I assume its called?) I cannot see an option to un install, but there is a button called "clear data". this does not remove the app, but it frees a small amount of useable space. I feel like I must have misunderstood something. the apps im talking about are things such as: hangouts, google play music, talkback, fm radio, google play movies and tv, gmail, etc... some of these apps I can see the use for, such as keyboard apps and camera. but others I have never used and I assume arnt necessary for the device to work correctly (therefore I assumed they fitted the definition of bloatware).
when I have used "clear data" I get usable space for apps of my choice, so im assuming that these apps arnt part of the system memory you mentioned?