I need help on these questions

QUESTION 7 A research group using hospital records developed the following mathematical model relating systolic blood pressure and age P(x) = 51 + 19LN(x+1) between 0 and 54 years. P(x) is pressure, measured in millimeters of mercury, and x is age in years . What is the rate of the change of pressure at the end of 7 years (put this answer in the answer blank rounded to two decimals) . What is the minimum and maximum systolic blood pressure? (show this work on your paper and box your answers) QUESTION 8 The following formula represents the volume of proliferating cells plus the volume of the quiescent cells t days after therapy for a tumor V (1) = Pe"+ Qem where P = proliferating cells = 0 007 with k = 0.1218 and Q = quiescent cells = 0.496 with m = 0.2431