To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.

Splashtop on Thursday released a new tablet application that replicates the Windows 8 touch-driven Metro user interface on the iPad, which should help developers test applications for Microsoft’s next ...

To followup on Neil's comment: I'm one of those people who likes LogMeIn -- however, I'll note that the free version doesn't support remote audio, so for your specific situation you'd probably have to ...