I II...\" Hlf) -l The height of a tree at time I is given by a twice-differentiable function H, where H (t) is measured in meters and r is measured in years. Selected values of H(r) are given in the table above. (3) Use the data in the table to estimate H '(6). Using correct units, interpret the meaning of H '(6) in the context of the problem. (b) Explain why there must be at least one time I, for 2