Respuesta :

Answer:

Step-by-step explanation:

hello : here is an solution

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9514 1404 393

Answer:

  y = 6√7

Step-by-step explanation:

Using the geometric mean properties of this geometry, we have ...

  y = √((12)(12+9)) = √(12·21) = √(36·7)

  y = 6√7

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