Please help for 7 and 8

QUESTION 7 Suppose the success of a cancer treatment y, measured in fraction cancer free, depends on the dosage, x, in mg, of treatment drug in the following way y = 1x 9 + x 2 Determine the dosage of the drug that maximizes treatment success (show on paper in your work) and the maximum possible fraction (enter in answer blank round to two decimals) cancer free. Explain the meaning of your answer with units. QUESTION 8 A research group using hospital records developed the following mathematical model relating systolic blood pressure and age P(x) = 40 + 28LN(x+1) between 0 and 43 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 11 years (put this answer in the answer blank rounded to two decimals) . What is the minimum and maximum systolic blood pressure