Question

Find x. Round to the nearest tenth

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

Answer 1

D

Explanation:

Using the cosine ratio in the right triangle

cos40° =
`(adjacent)/(hypotenuse)` =
`(x)/(6)` ( multiply both sides by 6 )

6 × cos40° = x , then

x ≈ 4.6 ( to 1 dec. place ) → D