Answer:
A. 64.7
Explanation:
This is a trig question. So you know that you will be using either Sine, Cosine, or Tangent. Since you are dealing with a obtuse and a opposite side to the angle that measures 18 degrees. So it would be Opposite over Hypothenuse which means you are using Sine. With So your equation would look like this Sine (18) = 20/x. After that you will input Sine (18) into the calculator and get 0.30901699437. Then you can multiply x on both sides. Making your new Equation 0.30901699437x=20. Then you can divide 0.30901699437 on both sides giving you 64.72282. When rounded to the nearest tenth it gives you 64.7. Making your answer A.