Question

Please tell me if I am correct? Six is the geometric mean of 18 and what number?

4
3
2
9

Is the right answer 2?

Answer 1

If you have 2 numbers x and y, then the geometric mean of those two numbers is

G = sqrt(x*y)

Answer 2

In this case, we're given

x = 18
y = unknown (leave it as y for now)
G = 6

Answer 3

so

G = sqrt(x*y)

6 = sqrt(18y)

6^2 = (sqrt(18y))^2

36 = 18y

18y =36

y = ???

Answer 4

So it would be 2 ?

Answer 5

correct