1.	Which pair of vectors is perpendicular?
		A.	,	B.	,
		C.	,	D.	,
		Hint
	2.	Find if and .
		A.		B.
		C.		D.
		Hint
	3.	Two vectors and are perpendicular if ________.
		A.	their dot product is equal to their cross product
		B.	their inner product equals zero
		C.	their inner product is v1w1 +v2w2
		D.	their cross product equals zero
		Hint
	4.	Find if and .
		A.		B.	-8
		C.	5	D.
		Hint
	5.	Find if and .
		A.		B.
		C.		D.
		Hint