h = 3a + 28.6
A pediatrician uses the model above to estimate the height b of a boy, in inches, in terms of the boy's age a,...

h = 3a + 28.6 A pediatrician uses the model above to estimate the height b of a boy, in inches, in terms of the boy's age a, in years, between the ages of 2 and 5. Based on the model, what is the estimated increase, in inches, of a boy's height each year?