Part 1:
The bearing of the lighthouse is 150° from the island. This means that the lighthouse is located 150° clockwise from due north. On the unit circle, the angle 150° is represented by the point (-√3/2, -1/2).
Part 2:
The ordered pair associated with the lighthouse on the unit circle is (-√3/2, -1/2).
Part 3:
The sine of the angle 150° is -√3/2. The cosine of the angle 150° is -1/2. The tangent of the angle 150° is -√3.