A dog’s life span is typically much shorter than that of a human. Age equivalents for dogs and humans are listed in the following table.

a) Use a graphing calculator to fit linear and cubic functions to the data. Which function has the better fit?

b) Using the function from part (a), estimate the equivalent human age for dogs that are 5, 11, and 15 years old.

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Age of Dog, x (in years) 0.25 0.5 1 2 4 6 8 10 14 18 21 Human Age, h(x) (in years) 5 10 15 24 32 40 48 56 72 91 106