Hong is cooking a roast. The table below gives the temperature R (t) of the roast (in degrees Celsius), at a few times t (in minutes) after he removed it from the oven. Time t (minutes) 0 15 30 60 75 Temperature R (t) (°C) 193.5 166.5 130.5 73.5 22.5 (a) Find the average rate of change for the temperature from 15 minutes to 30 minutes. *C per minute (b) Find the average rate of change for the temperature from 60 minutes to 75 minutes. C per minute

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