Step-by-step explanation
Significant figures are the digits of a number that are meaningful in terms of accuracy or precision.Also, digits of a number are not significant when they do not add information regarding the precision of that number, so for example.
the leading and trailing zeros do not affect preccion, so it has 2 S.f. (75)
A)The quantity 0.006382m
it has 4 S.f (6382)
B)The quantity 0.6382m
it has 4 s.f (6382)
C)The quantity 6.38200×104 m
it has 6 s.f ( 638200)
D)The quantity 63802m
it has 5 s.f (63802)
I hope this helps you