1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	one	B.	three
		C.	two	D.	four
		Hint
	2.	How many significant digits are in the number 0.000005721?
		A.	four	B.	six
		C.	two	D.	nine
		Hint
	3.	How many significant digits are in the number 0.000723?
		A.	6	B.	4
		C.	7	D.	3
		Hint
	4.	How many significant digits area in the number 0.009?
		A.	4	B.	3
		C.	1	D.	2
		Hint
	5.	Identify the precision unit of the ruler.
		A.	inch	B.	1 inch
		C.	inch	D.	inch
		Hint