Use what you know about trigonometry to find cos x and then x. Explain what you did to find your answer.
A) cos x = 0. 5; x = 60 degrees
B) cos x = 0. 7071; x = 45 degrees
C) cos x = 0. 866; x = 30 degrees
D) cos x = 0. 2588; x = 75 degrees