Respuesta :

Answer:

D. 9

Step-by-step explanation:

We know that cos theta = adjacent / hypotenuse

                        cos 60 = x /18

 Multiply each side by 18

                        18 cos 60 = x/18 * 18

                          18 cos 60 =x

                         9 =x

The correct answer is D. 9

:)