1. The problem statement, all variables and given/known data Let x(k)= 0 k<0 0.6^k 0<=k<=21 0 k>21 Calculate X(z) 2. Relevant equations Z transform 3. The attempt at a solution Ok so i think calculating the Z transform of this wont be too difficult for me at all. I just have a hard time with this type of notation. So what i would like to some help on is how to rewrite the equation x(k). I understand that x(k)=0.6^k and for K is between 0 and 21. Any values outside of that x(k) = zero..... So how do I assemble X(k) in a form that I can do a z transform to it? It seems like it should be easy but I just dont see it. Something with a summation maybe and a limit of 0 -> 21? Thanks for any comments guys!