The height of a certain species 't' years after it was planted is given by
H=20ln(3t +2) +30cm
a) how tall was the shrub when it was planted
b) how long will it take for the shrub to reach a height of 1 metre
c)At what rate is the shrubs height changing
i) 3 years after being planted
ii) 10 years after being planted
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