Question

Which of the following measurements is expressed to three significant figures?
a. 0.0006 m
b. 6066 mg
c. 6.40 10-7 km
d. 0.060 mm

Answer 1

C is correct
process of elimination will help you prove your answer
a- numbers trailing a decimal before a nonzero digit are not significant
b- zeros between nonzero are significant
d-the zero before the 6 is not significant