Answer:
D) 12.4
Explanation:
You want the adjacent leg to an angle of 39° in a right triangle with hypotenuse 16.
Cosine
The relation between the side adjacent to the angle, and the hypotenuse, is ...
Cos = Adjacent/Hypotenuse
Multiplying by the hypotenuse gives ...
hypotenuse · cos = adjacent
16·cos(39°) = x
12.4 = x
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Additional comment
Perhaps your teacher is confused. Choice A is correct if the positions of x and 16 are swapped in the figure.
The leg length (x) cannot be greater than the hypotenuse (16), so choices A and C can be eliminated immediately. Answer choice B corresponds to an angle of 33.1°, which is nowhere to be found in this figure.
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