Question

Find x. Round to the nearest tenth

A: 5.0
B: 7.8
C: 3.9
D: 4.6

Answer 1

Answer:

D

Step-by-step explanation:

Using the cosine ratio in the right triangle

cos40° = $\frac{adjacent}{hypotenuse}$ = $\frac{x}{6}$ ( multiply both sides by 6 )

6 × cos40° = x , then

x ≈ 4.6 ( to 1 dec. place ) → D