What is the geometric mean of 7 and 13?

i got up to this step but i don't understand what it's telling me to do in the last step.

  √91 ≈ 9.5394

Step-by-step explanation:

Take the square root of 91 to find the value of x. There is no simpler radical form. You can write it as ...

  x = √91 . . . . . . . simplest radical form

or as

  x ≈ 9.5394 . . . . an approximation of the irrational root

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol