Question

please help!! Really short on time!!! can someone explain how to do this​

Answer 1

Answer:

$3\sqrt{7}$

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.

Answer 2

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