1.	The equation of a circle is 3x2 + 3y2 – 6x + 12y – 24 = 0. Find its center and radius.
		A.	(1, –2); 13	B.	(–1, 2); 13
		C.	(–1, 2);	D.	(1, –2);
		Hint
	2.	Write the equation of the circle whose diameter has endpoints at (3, –1) and (–9, 5).
		A.	(x + 3)2 + (y – 2)2 = 45
		B.	(x – 3)2 + (y + 2)2 = 13
		C.	(x + 3)2 + (y – 2)2 = 13
		D.	(x – 3)2 + (y + 2)2 = 45
		Hint
	3.	Write the equation of the circle that is tangent to the line with equation x + y = –3 and has its center at (4, –1).
		A.		B.
		C.	(x – 4)2 + (y + 1)2 = 18	D.	(x + 4)2 + (y – 1)2 = 18
		Hint
	4.	Write the equation of a circle that has a diameter with endpoints at (1, 0) and (5, 4).
		A.	(x - 3) 2 + (y - 2) 2 = 64
		B.	(x + 3) 2 + (y + 2) 2 = 8
		C.	(x - 3) 2 + (y - 2) 2 = 8
		D.	(x + 3) 2 + (y - 2) 2 = 64
		Hint
	5.	The equation of a circle is (x - 8) 2 + (y + 3)2 = 48, find the center and the radius.
		A.	(8, 3);	B.	(8, -3);
		C.	(-8, -3);	D.	(-8, 3);
		Hint