1.	Find an equation of a circle if the endpoints of a diameter are at (-2, -3) and (1, 7).
		A.	(x - 1)2 + (y - 7)2 = 109
		B.	(x + 2)2 + (y + 3)2 = 109
		C.
		D.
		Hint
	2.	Find the radius of a circle with the equation x2 + y2 + 6x - 10y + 28 = 0.
		A.	6	B.	3
		C.	5	D.
		Hint
	3.	What is an equation for a circle if the endpoints of a diameter are at (3, 4) and (-3, -2)?
		A.		B.
		C.		D.
		Hint
	4.	Write the equation in standard form.
		A.		B.
		C.		D.
		Hint
	5.	Which of the following could be the center of a circle that is tangent to the lines y = 3 and x = –2?
		A.	(2, -1)	B.	(0, 0)
		C.	(2, 1)	D.	(-3, 1)
		Hint