Respuesta :

frika

Answer:

C. x=5 units.

Step-by-step explanation:

In right triangle ABC, the height BD is the geometric mean of the segments AD and DC.

Hence,

[tex]BD^2=AD\cdot DC,\\ \\10^2=x\cdot 4x,\\ \\100=4x^2,\\ \\x^2=25,\\ \\x=5\ un.[/tex]

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