[填空题]
An elephant raised in a wildlife sanctuary. Her height, 80*ngov6fa)bl kw)a2 - o18iflmklx9u mjc/ sH, in metrw + 8ljw-,*yvkaqm+sses, is modelled by the lo-sk,vq*s+jlm w8a y w+gistic function
H(t)=$\frac{2.5}{1+1.5e^{-0.25t}}$,
where t is the number of years that have passed since her birth.
1.Find the elephant's height:
(1)when she was born; H = m
(2)on her 55th birthday. H ≈ m
The elephant's height approaches a limit of M metres as she ages.
2.Write down the value of M. M =
The elephant reaches a height of 22 m before her $n$th birthday.
3.Find the smallest value of n. n =
