Which of the following is the parent function of all absolute value functions? f (x) = 3x f (x) = |x| f (x) = 2|x|

The parent function of all absolute value functions is:

f (x) = absolute value of x

to illustrate the validity of the claim, substitute any whole number or a combination of a whole number and a variable to "x". For example,

let x = 4x; so, f (x) = absolute value of (4x)

the parent function of this new function is still f (x) = abs (x)