Question six about significant figures, !

rules to find :- 1 All non zeroes number are significant

2  if zero proceeding the decimal point also work as non zero figure

3 zero are following the decimal point and proceeding the first non zero digit

4 Zero in between 2 non zero digits are also significant

5 if 1 zero follow the decimal point

790  :-    2 significant figures

0.0391 :-  3 significant figures ( follow 3 rule)

81.05  :- 4 significant figures  ( rule 4)

0.000001 :-   1 significant figure

8546 :-        4 significant figures

79.0 :-         3 significant   ( rule 5)