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

	2.	Determine whether the number is rational or irrational.
		A.	both	B.	rational
		C.	neither	D.	irrational
		Hint

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

	4.	Which equation represents exponential growth?
		A.	y = 250 · ^x	B.	y = 250 × 0.4c
		C.	y = 250 × 0.25^x	D.	y = 250 × 4^x
		Hint

	5.	Which equation represents exponential decay?
		A.	y = 63 × 0.4^x	B.	y = 63 × 4^x
		C.	y = 63 × 4.4^x	D.	y = · 63^x
		Hint

	6.	Evaluate.
		A.	–3	B.	2
		C.	–2	D.	3
		Hint