Answer:
y ≈ 16.0
Step-by-step explanation:
using the cosine ratio in the right triangle
cos64° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{7}{y}[/tex] ( multiply both sides by y )
y × cos64° = 7 ( divide both sides by cos64° )
y = [tex]\frac{7}{cos64}[/tex] ≈ 16.0 ( to 1 decimal place )
