Answer:
it is a simultaneous equation and I used Elimination method
A plane has to travel 2,800 miles at an average speed of 560 miles per hour. How many hours will it take to reach its destinatio
2 answers:
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Answer:
<u>Step-by-step explanation:</u>
Given: cos x = , x is in Quadrant 4
Use Pythagorean Theorem to find sin x:
8² + y² = 17²
y² = 17² - 8²
y² = 289 - 64
y² = 225
y = 15
→ sin x =
Use the double angle formula to find cos (2x):