1.	Express 7-3 using positive exponents.
		A.		B.	(-7)3
		C.		D.
		Hint
	2.	Write using negative exponents.
		A.	-24	B.	-2-4
		C.	2-3	D.	2-4
		Hint
	3.	Write the expression 5-4 using a positive exponent.
		A.		B.
		C.	54	D.	-54
		Hint
	4.	Write as an expression using a negative exponent.
		A.	2-6	B.	-26
		C.		D.
		Hint
	5.	Evaluate x-4 if x = 3.
		A.		B.	81
		C.	-81	D.
		Hint