Answer:
Step-by-step explanation:
Cos 2A = 2Cos² A - 1
x = 71°
By applying triangle sum theorem in ΔBHD,
m∠DBH + m∠BHD + m∠HDB = 180°
40° + m∠BHD + 31° = 180°
m∠BHD = 180° - 71° = 109°
m∠BHD + m∠DHE = 180° [Linear pair of angles]
109° + x° = 180°
x = 180° - 109°
Each line on the number graph after 35,926 has a value of one. Thus, C) is the correct answer.
