A pediatrician uses the model h = 3a + 28.6 to estimate the height h of a boy, in inches, in terms of the boy's age a, in years, between ages 2 and 5. Based on the model, what is the estimated increase, in inches, of a boy's height each year?
A14.3
B3
C5.7
D9.5
Answer & Solution
Correct answer: B. 3
The model is linear: h = 3a + 28.6. The coefficient of a (slope) gives the change in h per unit change in a. So each additional year adds 3 inches to estimated height.
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