1.	Express 7-3 using positive exponents.
		A.	(-7)3	B.
		C.		D.
		Hint
	2.	Write a2b-3 using positive exponents.
		A.		B.
		C.		D.
		Hint
	3.	Write using negative exponents.
		A.	2-3	B.	-2-4
		C.	2-4	D.	-24
		Hint
	4.	Write the expression 5-4 using a positive exponent.
		A.		B.	-54
		C.	54	D.
		Hint
	5.	Evaluate y-5 if y = -2.
		A.		B.	32
		C.		D.	-32
		Hint