1.	What are the coordinates of the midpoint of the segment with endpoints C(2, -4, 6) and D(7, 2, -5)?
		A.	(5, 6, -11)	B.	(-2.5, -3, 5.5)
		C.	(9, -2, 1)	D.	(4.5, -1, 0.5)
		Hint
	2.	What are the coordinates of the center and the measure of the radius for the sphere with equation (x + 2)2 + (y - 5)2 + (z - 1)2 = 16?
		A.	(2, -5, -1); 4	B.	(2, -5, -1); 16
		C.	(-2, 5, 1); 4	D.	(-2, 5, 1); 16
		Hint
	3.	Which is the equation of the sphere with its center at (4, -2, 4) and passing through (-1, 0, 3)?
		A.	(x - 4)2 + (y + 2)2 + (z - 4)2 = 30
		B.	(x + 1)2 + y2 + (z - 3)2 = 5
		C.
		D.	(x + 4)2 + (y - 2)2 + (z + 4)2 = 6
		Hint
	4.	Find the midpoint of the line with endpoints of (-4, -2, 4) and (3, 7, 2).
		A.	(-0.5, 2.5, 3)	B.	(-1, 4, 2)
		C.	(-3.5, -4.5, 1)	D.	(-4, 2, 3)
		Hint
	5.	One airplane has coordinates of (15, 25, 62) and a second airplane has coordinates of (2, -14, 92). How far apart are the two planes?
		A.	19.1	B.	146.8
		C.	155.2	D.	50.9
		Hint