Respuesta :

SaltySpark

Answer:

[tex]3\sqrt{7}[/tex]

Step-by-step explanation:

You can use something called geometric mean. For two numbers, its the square root of them multiplied together. So in this case, the square root of 63 = y.

alinacorn1120
The third one. the one that says 3 triangle looking thing, 7

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