
	1.	Express 0.0000421 in scientific notation.
		A.	4.21 × 10^-4	B.	4.21 × 10^-6
		C.	4.21 × 10^-9	D.	4.21 × 10^-5
		Hint

	2.	Simplify Assume the denominator is not equal to zero.
		A.		B.
		C.		D.
		Hint

	3.	Evaluate . Express the result in scientific notation.
		A.	0.8 × 10^-8	B.	8.0 × 10^-7
		C.	80 × 10^-8	D.	8.0 × 10^-9
		Hint

	4.	Use an exponent to write 177,147 as a power of 3.
		A.	3⁹	B.	3¹⁷
		C.	3¹⁹	D.	3¹¹
		Hint

	5.	Which number is not equal to the other three?
		A.	2^-2	B.
		C.		D.
		Hint