1.	Simplify the expression (5 – 2i) – (2 – 7i).
		A.	7 + 5i	B.	3 + 5i
		C.	3 – 9i	D.	7 – 9i
		Hint
	2.	What is the conjugate of –9 – 2i?
		A.	–9 + 2i	B.	2 – 9i
		C.	2 + 9i	D.	9
		Hint
	3.	Simplify (3 + 4i) + (5 – 7i).
		A.	8 - 3i	B.	15 - 28i
		C.	7 - 2i	D.	-4 + 9i
		Hint
	4.	What is the complex conjugate of a - bi, if a and b are real numbers?
		A.		B.	a - bi
		C.	a + bi	D.	a2 + b2 - abi
		Hint
	5.	Simplify .
		A.		B.
		C.		D.
		Hint