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Answer:
Ely's solution is the correct one
Step-by-step explanation:
use tangent = opposite / adjacent
in this case, angle is 40 degrees which is opposite the vertical side of the triangle that measures 100 m (given). adjacent to the angle is the distance between the airplane and airport (unknown, let this be x)
tan 40 = 100 / x
x = 100 / tan 40