1.	What is the conjugate of 12 - 4i?
		A.	12	B.	-4i
		C.	12 + 4i	D.
		Hint
	2.	Find the product of -15i and its conjugate.
		A.	-225	B.	225i
		C.	15i	D.	225
		Hint
	3.	Simplify (7 - 2i)(7 + 2i).
		A.	33	B.	49
		C.	53	D.	45
		Hint
	4.	Simplify
		A.		B.
		C.		D.
		Hint
	5.	Simplify
		A.		B.
		C.		D.
		Hint