Read the following passage and answer the questions given below:
The relation between the height of the plant ( ‘y’ in cm) with respect to its exposure to the sunlight is governed by the following equation y=4x-1/2 x^2, where ' x ' is the number of days exposed to the sunlight, for x≤3.
(i)Find the rate of growth of the plant with respect to the number of days exposed to the sunlight