$\"\"$

From the diagram, x is adjacent to $\"\"$ and hypotenuse is $\"\"$ .

$\"\"$ (Definition of cosine ratio)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Use a calculator to approximate $\"\"$ )

$\"\"$ (Multiply each side by $\"\"$ )

$\"\"$ (Cancel common terms)

$\"\"$ (Multiply: $\"\"$ )

$\"\"$

The nearest tenth value of x is $\"\"$ .