| L Page view | A" Read aloud 3. [4 marks] Differentiate the following functions and simply the answers fully: (a) f(x) = ev3x* +372+1 (b) f (x) (513 + 2x2 + 2) (Inr) 4. [4 marks] The apparent temperature of the air at a certain temperature and humidity level is kr represents the relative humidity (in percent), then the heat index (in degrees Fahrenheit) for an can be approximated by the function f(x) = 0.00912 + 0.139r +91.875. (a) When the humidity level increases from 30% to 50%, what is the average rate of change of your answer. O