1.	Write the number 4.5 × 10-6 in standard form.
		A.	0.0045	B.	0.0000045
		C.	0.045	D.	0.00045
		Hint
	2.	Express 3.157 ×10-4 in standard form.
		A.	0.0003157	B.	0.00003157
		C.	31,570	D.	0.003157
		Hint
	3.	Express 0.0000000139 in scientific notation.
		A.	1.39 × 108	B.	1.39 × 10-7
		C.	1.39 × 10-8	D.	1.39 × 10-9
		Hint
	4.	On July 18, 2001, the United States national debt was $5,633,569,000. Write this number in scientific notation.
		A.	5.633569 × 10-9	B.	5.633569 × 1010
		C.	5.633569 × 108	D.	5.633569 × 109
		Hint
	5.	Write 0.0000055 in scientific notation.
		A.	5.5 × 106	B.	5.5 × 10-6
		C.	55 × 107	D.	55 × 10-7
		Hint