13.7 Exercises i ~ t i dgive - 335- the region of convcrgcncc for cach Xotc: bee Exaniples 13.2 and 13.3 xercise 13 xercise 13.4 a ) Fiud thc x-transbrrns of the low-pass inipulsc responses zl,[k] ot>herwisP I p=-l b) Give the s-prtra ;C,(.~,[k]) and sketch thc given sequences arid rrmgriiturlcs of the spectra Prow the followiiig theoreins of the c-transform: iisirig the rleiinirig equation (13.I ) ~