1 (a)103
  (b) 40
2(a)20
  (b)20  
3.(a) 4
  (b) 0.8665  Answer is correct for any number between 0.8666 to 0.8667
4. i
5. i 
6.(a) 1.2 Answer is correct for any number between 1.1 to 1.3
  (b) 0.8718 Answer is correct for any number between 0.8716 to 0.8719
  (c) 0.3 Answer is correct for any number between 0.25 to 0.35
7. 3.5 Answer is correct for any number between 3 to 4