parachutist jumps out of a plane.  Her height, in metres, above the ground after t seconds is given by s(t) = 1750 – 4.9t2, 0 ≤ t ≤19. a) Determine an algebraic expression in terms of a and h to estimate the average rate of change, over the time interval a ≤ t ≤ a+h b) Use the equation you obtained from part a) to estimate the instantaneous rate of change of her height at each time.  Evaluate with h = 0.01 t = 8 s

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