Blood Pressure and Age A research group developed the following mathematical model relating systolic blood pressure and age: P(x) = a+bln(x + 1), where P(x) is pressure, measured in millimeters of mercury, and a is age in years. By examining Guilford County hospital records, they estimate the values for Guilford County to be a = 35 and b = 23. Using this model, estimate the rate of change of pressure with respect to time after 16 years. Round to the nearest hundredth (2 decimal places). millimeters per year I