1.	Using Snell's Law, = n, and = 40° and = 35° 15', find the index of refraction, n. (Use a calculator.)
		A.	about 1.1137	B.	about 0.8979
		C.	about 1.0660	D.	about 0.9380
		Hint
	2.	If find
		A.		B.	7
		C.		D.
		Hint
	3.	If , find .
		A.	3	B.
		C.		D.
		Hint
	4.	Which is an example of a cofunction relationship?
		A.	sin 30° = sin 60°	B.	sin 30° = cot 60°
		C.	sin 30° = tan 60°	D.	sin 30° = cos 60°
		Hint
	5.	Use a calculator to determine the value of cos 42° 39'.
		A.	0.921	B.	1.360
		C.	0.678	D.	0.736
		Hint