522 Appenciix A Solutions to thr Exercisrs 10 h=O k 10 h ~ 10 10 =o k=O - _ -1 - 0.82 -_ 1, 0.8 - < J i< / 1.25 Solution 13.2 &(z) = z 0.8 z-0,5 z-0.8’ ~ 0.5 < ~