As far as I can see, you can't really tell what “address you are sending them from”, you can only control the account — and one account can have many addresses.

If you have been receiving all your NOBL with one address only, you can tell what address you will be sending from.  But if you have recived your NOBL with several addresses, there's no way to tell what the outgoing address will be.

I used the “getaddressesbyaccount” to determine which addresses were included in that account, and luckily the command returned only two addresses, one of which I had received most of my NOBL into.  I then used the "sendfrom" command to transfer the NOBL to the burning address, and the transaction included a plethora of input — of which the majority involved one of the two addresses.

Of course, you can “setaccount ” to a freshly named account with a virgin address, transfer all your NOBL to that “noblecoinaddress” and then “sendfrom” that account, but then the whole procedure gets unnecessarily complicated.

Cheers.