Example 2: 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. Q1: What are the variable values in the problem above? Q2: How tall would the doctor expect the boy to be after 3 years? Q3: If the patient is 43.6 inches tall, how old is he? Q4: How many years would it take for the boy to be at least 5 feet tall? Q5: How tall does the doctor expect the boy to be initially (to start?) How do you know?