Hello!

How to solve these signals in order to find the z-transform and ROC?

Thanks in advance

See Oppenhiem and Schaffer for concepts and worked examples.

OK I found it

Is that an examination question?

For the first I found something like that

This doesn't answer your question, but it might shorten the design time for a real system:

https://www.researchgate.net/publication/343124231...