Answer:
4
Step-by-step explanation:
The proportional relationship can be described by the equation ...
[tex]f=\dfrac{k}{\sqrt{g}}[/tex]
We can fill in the given values to find k:
15 = k/√144 = k/12
15·12 = k = 180 . . . . . . multiply by 12
Then for f = 90, we have ...
90 = 180/√g
1/2 = 1/√g . . . divide by 180; next multiply by 2√g and square both sides
g = 2² = 4 . . . . the value of g when f=90
