Can I Send my Z address to my friends T address ?
Yes you can (unless Nighthawk doesn’t support it? I know they didn’t but may have changed)
And just so you know, the T means transparent so once its sent form Z to T (called ‘deshielding’) it has the same amout of public visibility as bitcoin or any other fully public ledger copy of it
@NighthawkWallet supports Z to T transactions on both Android & iOS