1. 
  (a)0
  (b)Yes
2 (a) (i) 6
      (ii)5
 (b)  (i) -2
      (ii) 25
3.(a) (i)11
      (ii)7
  (b) (i)26
      (ii)49
4.(a) (i)1
      (ii)5
  (b) (i)14
      (ii)25
5.(a) 4
  (b) (i) 8
      (ii) 3
6. 4
7. (i) 1
   (ii)4
8.2