Answer:
B. 16.5
Explanation:
Here we can use the opposite and the adjacent from the angle with measurement 20, or tan.
tan theta = opposite / adjacent
Substitute values.
tan 20 = 6 / x
Multiply by x.
x * tan 20 = 6
Divide by tan 20.
x = 6 / tan 20
Evaluate tan 20.
x = 6 / 0.36397023
Divide.
x = 16.48486451
Rounded to the nearest tenth, that makes your answer
B, 16.5