1.	Express 7,000,000,000 in scientific notation.
		A.	7 × 109	B.	7 × 106
		C.	7 × 108	D.	7 × 1012
		Hint
	2.	Express 0.0000421 in scientific notation.
		A.	4.21 × 10-9	B.	4.21 × 10-5
		C.	4.21 × 10-4	D.	4.21 × 10-6
		Hint
	3.	Express 7.6109 × 108 in standard form.
		A.	761,090,000	B.	0.000000076109
		C.	7,610,900,000	D.	76,109,000
		Hint
	4.	Express 2,475,000 in scientific notation.
		A.	2.475 × 10-6	B.	2.475 × 105
		C.	2.475 × 106	D.	2.475 × 103
		Hint
	5.	Express 0.0000000139 in scientific notation.
		A.	1.39 × 108	B.	1.39 × 10-8
		C.	1.39 × 10-9	D.	1.39 × 10-7
		Hint