Determine the scale factor of the function f(x)=1/3root x

Please be clear with the expressions.
Here we assume 
f(x)=(1/3) sqrt(x)

A scale factor is a multiplier applied to a parent function.
If the parent function is f(x), and
g(x)=a*f(x), then a is a scale factor.

Assuming the parent function is sqrt(x), and f(x)=(1/3) sqrt(x)
then the scale factor is  (1/3).
[note]
if f(x) is a cube root, then write
f(x)=cube root(x), or f(x)=x^(1/3).
the exponentiation sign ^ is very useful.

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