The total revenue from the sales of a certain product are given by 
Find the marginal revenue.
Definitions:
Single-parent Families
Family units comprised of one parent raising one or more children, which can present unique challenges and dynamics.
Sibling Intimacy
The closeness, trust, and emotional connection that exists between siblings, which can influence social development and psychological well-being.
Opposite Sexes
Refers to the two main categories of sex, male and female, based on biological differences.
Age Difference
The gap or difference in years between the ages of two or more individuals.
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