this is grade 12 advanced functions and the unit is called polynomial functions pls solve using those methods and not any other one non related thanks.

4. On Earth, the height, h, in metres, of a free falling object after t seconds can be modeled by the function h(t) = -4.9t' + k, while on Venus, the height can be modeled by h(t) = -4.45 t* + k, where t 2 0 and k is the height, In metres, from which the object is dropped. Suppose a rock is dropped from a height of 60 m on each planet. For each planet, [4A] (a) Determine the average rate of change of the height of the rock after the first 3 seconds after it is dropped (L.e. Ost s 3) (b) Estimate the instantaneous rate of change of the rock 3 seconds after it is dropped