A formula for the relationship between weight and blood pressure in children is given by the formula below where​ p(x) is measured in millimeters of mercury and x is measured in pounds. use the formula to answer the questions.
P(x)=12.9(9+In x) 10≤x≤100

What is the rate of change of blood pressure with respect to weight at the 50 dash pound weight​ level? the rate of change at the 50 dash pound weight level is approximately 0.35 ​mm/pound. ​(do not round until the final answer. then round to the nearest hundredth as​ needed.)