question 9

Essay

$\text { Prove that if } f : X \rightarrow Y \text { and } g : Y \rightarrow Z \text { are onto, then } g \circ f : X \rightarrow Z \text { is also onto. }$

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Definitions:

Cohort

A group of people born at about the same time.

Normative History-Graded

Influences that are common to a particular generation or cohort as a result of living in the same period of history.

Contraceptive Pill

A medication used to prevent pregnancy, typically containing hormones that inhibit ovulation.

Worldwide Economic Depression

A prolonged period of extreme economic downturn across multiple countries, characterized by high unemployment, low production, and financial instability.