The parent absolute value function is given by f(x) = |x|. It is a V-shaped graph with the vertex at the origin.
The function is decreasing over the interval (-∞, 0), meaning that as x moves from negative infinity to zero, the value of f(x) decreases.
To see this, consider the values of f(x) for some x values in this interval:
f(-3) = |-3| = 3
f(-2) = |-2| = 2
f(-1) = |-1| = 1
f(0) = |0| = 0
As x moves from -3 to -2 to -1, the value of f(x) decreases from 3 to 2 to 1. Therefore, the function is decreasing over this interval.