I got an app that says "size 1.34GB" I have 2.9GB I still can't download it. Can someone help me!?!?

It depends what 2.9GB means. It could mean how much space you have left or how much space your device has in total. If it is how much space is left, then that wouldn't make much sense. But if it is how much space your device has in total, then that would make sense because you are likely already using more than 1.56 GB of memory (2.9 - 1.34) which would mean the app wouldn't be able to fit on your device. If 2.9GB means how much room you have left, then you should check the app's requirements.