1.	Find an equation of a circle if the endpoints of a diameter are at (-2, -3) and (1, 7).
		A.
		B.
		C.	(x + 2)2 + (y + 3)2 = 109
		D.	(x - 1)2 + (y - 7)2 = 109
		Hint
	2.	Find the coordinates of the center of a circle with equation x2 + y2 - 2x + 8y + 13 = 0.
		A.	(1, 4)	B.	(-1, -4)
		C.	(1, -4)	D.	(-1, 4)
		Hint
	3.	Find an equation for the graph below.
		A.	(x + 4)2 + (y - 1)2 = 2	B.	(x + 4)2 + (y - 1)2 = 4
		C.	(x - 4)2 + (y + 1)2 = 2	D.	(x - 4)2 + (y + 1)2 = 4
		Hint
	4.	What is an equation for a circle with a center at (3, -1) that is tangent to the line x = 7?
		A.		B.
		C.		D.
		Hint
	5.	What is equidistant to all of the points on a circle?
		A.	diameter	B.	center
		C.	radius	D.	tangent line
		Hint