Find the approximate change in z when the point 
changes from 
to 
. 
; from 
to 
Definitions:
Parent-Child Relationships
The dynamic and emotional bond between parents and their children, influencing their development and well-being.
Never-Married Mothers
Women who have children but have never been married, highlighting a specific family structure.
Infants
Very young children or babies, typically under one year of age, who are in the earliest stage of human life.
Economic
Relating to the production, consumption, and transfer of wealth within a society.
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