Question

Need desperate help!

Answer 1

x ≈ 10.7

Explanation:

using the cosine ratio in the right triangle

cos68° =
`(adjacent)/(hypotenuse)` =
`(AC)/(AB)` =
`(4)/(x)` ( multiply both sides by x )

x × cos68° = 4 ( divide both sides by cos68° )

x =
`(4)/(cos68)` ≈ 10.7 ( to 1 decimal place )