During a certain period in the life of an earthworm,
its length, L cm, is directly proportional to the
square root of N, where N is the number of hours
after its birth. One hour after an earthworm is born,
its length is 2.5 cm.
(1) Find an equation connecting L and N.
(ii) Find the length of an earthworm 4 hours after
its birth.
(iii) How long will it take for an earthworm to grow
to a length of 15 cm?
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