Find the first partial derivative for the function 
with respect to z.
Definitions:
Family Demographics
Statistical data relating to the characteristics of families within a population, such as size, structure, and socioeconomic status.
Educators
Individuals such as teachers, professors, and trainers who are responsible for teaching and facilitating learning for students at various levels.
Parental Divorce
The legal dissolution of a marriage by a court or other competent body, which results in the separation of the parents.
Remarriage
The act of marrying again after a divorce or the death of one's spouse.
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