There is a saying that every year of a dog's life is equal to 7 years for a human. A more accurate approximation is given by the graph off at the top of the next column. Given a dog's age x, where x ≥ 1, f(x) models the equivalent age in human years. According to the Bureau of the Census, middle age for people begins at age 45.

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Equivalent age (years) 100 90 80 70 60 50 40 30 20 10 y=f(x) 0 2 4 6 8 10 12 14 16 18 20 Dog's age (years)