For the drug metabolism function (x) - -xx+21x-3) , find the average rate of change of (x) on the interval from x - 0 to x - 2. This value expresses the rate of increase in drug concentration per hour for this interval. State your answer as an integer. ppm\hour Question 7 (2 points) For the drug metabolism function /(x) - -x(x+2)(x-3) , find the average rate of change of (x) on the interval from x - 2 to x - 3. This value expresses the rate of decrease in drug concentration per hour for this interval. State your answer as an integer. Af AX ppm/hour Question 8 (3 points) Avalanche researchers have collected data to model the air temperature profile just above the snow surface over a period of several hours on a particular day: T (t) = -- 80 (+4 - 40t2 + 144) where t is time in hours on a practical domain [0,5] from midnight and T is the temperature in degrees Celsius. Answer the following questions. What is the air temperature at midnight? Express as a decimal to the nearest tenth: When is the air temperature at freezing? During what time interval, in the practical domain, is the air temperature above freezing? During what time interval, in the practical domain, is the air temperature below freezing