Answer:
156.37°
Step-by-step explanation:
We solve this above question, using Cosine rule which is given as:
Cos C = a² + b² - c²/2ab
Let the Angle be represented as: x
Cos x = 310² + 200² - 150²/2 × 310 × 200
x = arc cos [ 310² + 200² - 150²/2 × 310 × 200]
x = 23.63°
The angle, in degrees, that he must turn through to head straight for Island B is given as:
180° - 23.63°
= 156.37°
First, multiply both sides by 4:
(3x - 4)/4 = 5x + 2
3x - 4 = 4(5x + 2)
3x - 4 = 20x + 8
-12 = 17x
x = -12/17
Hope this helps!
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