Determine where the function is concave upward. 
Definitions:
Sexual Orientation
A person's pattern of romantic or sexual attraction to others, based on the gender(s) to which they are attracted.
Variable Over Time
An element or feature that changes in value or magnitude over a period.
Maternal Love
Affection, care, and nurturing provided by a mother or mother figure towards her offspring.
Father-absent Home
A family structure where the father is physically absent, which may influence various aspects of a child's development and socialization.
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