Chapter P - Preliminary Concepts - P.3 - Informal Geometry and Measurement - Exercises P.3 - Page 25: 50

$$ E 24 ^{\circ} S $$

We are asked to find the bearing of Plane C. This means we first start in a reference direction. We choose East since this is the closest reference direction to where the plane is. We see that plane C is 24 degrees off of the East reference direction in the direction of the South reference direction. Thus, we write: $$ E 24 ^{\circ}S $$