1. a) z = 0
   b) z = 8
   c) z = 1
   d) z = 2
   e) z = 9

2. a) q = 4, r = 2
   b) q = 5, r = 3
   c) q = 3, r = 1

3. a) s = 3
   b) s = 9
   c) s = 4
   d) s = 9
   e) s = 2