Question

Please help with this question

Answer 1

15/17

Explanation:

You can use what is called the Pythagorean identity:

sin(θ)² + cos(θ)² = 1

(-8/17)² + cos(θ)² = 1

cos(θ)² = 1 - 64/289 = 225/289

cos(θ) = √(225/289)

cos(θ) = 15/17 . . . . . . . cosine is positive in the 4th quadrant