Question

I have no clue how to do this, how do you solve it and what is the answer?
What is m∠X to the nearest degree?

Answer 1

Answer: Choice A) 44

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Work Shown:

cos(angle) = adjacent/hypotenuse

cos(X) = 13/18

X = arccos(13/18)

X = 43.7617 approximately

X = 44

Side note: The arccosine function is the same as inverse cosine as notated by $\cos^{-1}$. Make sure your calculator is in degree mode.