Answer:
x = 3.5
Step-by-step explanation:
Since CD is the angle bisector of ∠ACB then the following ratios are equal
[tex]\frac{AC}{BC}[/tex] = [tex]\frac{AD}{DB}[/tex]
substitute the given values into the equation
[tex]\frac{5}{6}[/tex] = [tex]\frac{x}{4.2}[/tex] ( cross- multiply )
6x = 21 ( divide both sides by 6 )
x = 3.5
