Answer:
x ≈ 73.3
Step-by-step explanation:
Using the cosine ratio in the right triangle
cos39° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{57}{x}[/tex] ( multiply both sides by x )
x × cos39° = 57 ( divide both sides by cos39° )
x = [tex]\frac{57}{cos39}[/tex] ≈ 73.3 ( to the nearest tenth )
