In the first few days of its life,the length of an earthworm L is thought to
问题描述：
In the first few days of its life,the length of an earthworm L is thought to
be proportional to the square root of the number of hours n which have
elapsed since its birth.If a worm is 2cm long after 1 hour,find:
(a) a formula for L in terms of n.
(b) How long will it take to grow to a length of 14cm?
答
（a）L=2√n
(b) L=14
n=49
49hours请问你的n为什么等于49 - -L=14=2√n√n=7n=7^2=49