Solve the problem.The index of refraction for air, Ia, is 1.0003.The index of refraction for water, Iw, is 1.3.If 
= 
, and A = 31.5°, find W to the nearest unit.
A. 24°
B. 21°
C. 22°
D. 23°
Answer: A
Mathematics
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Find the sum.5 + (-15) + 1
A. -9 B. 19 C. -11 D. 21
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Find the exact value of the trigonometric expression without the use of a calculator.sin 15°
A. - 
B. 
C. - 
D. 
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