this question is from edexcel c3 june 05...
7.
A particular species of orchid is being studied. The population p at time t years after the study
started is assumed to be
p = (2800ae^0.2t) / (1 + ae^0.2t)
, where a is a constant.
Given that there were 300 orchids when the study started,
(a) show that a = 0.12,
(b) use the equation with a = 0.12 to predict the number of years before the population of orchids reaches 1850.
any 1 know how to do part (b)??
thanx in advance