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4. The path of a baseball relative to the ground can be modelled by the function d(t) = t2 + 8t + 1, where d(t)

4. The path of a baseball relative to the ground can be modelled by the function d(t) = t2 + 8t + 1, where d(t) represents the height of the ball in metres, and t represents time in seconds. a. Find the average rate of change of the ball between 1 and 3 seconds. (4 marks) b. Using the secant method, find the instantaneous rate of change at 2 seconds. (8

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