Chapter 2 - Acute Angles and Right Triangles - Section 2.5 Further Applications of Right Triangles - 2.5 Exercises - Page 86: 5

B

When expressing bearing, either N or S always comes first, followed by an acute angle, and then E and W. We select graph B. Since N comes first, we need to subtract the $20^{\circ}$ from the $90^{\circ}$ quadrant. This is $70^{\circ}$ . So, the measure of bearing starting in N with $70^{\circ}$ to W is graph B.