Answer:
y ≈ 8.9
Step-by-step explanation:
Using the Sine rule in the triangle, that is
[tex]\frac{y}{sin67}[/tex] = [tex]\frac{8.7}{sin64}[/tex] ( cross- multiply )
y × sin64° = 8.7 × sin67° ( divide both sides by sin64° )
y = [tex]\frac{8.7sin67}{sin64}[/tex] ≈ 8.9 ( to 1 dec. place )
