A rectangle has sides of length x cm and 2x - 4cm and the length x cm at time t
seconds is given by x = 2 + 3t, (t >=0) . Show that the area, Acm2 , the rectangle, in
terms of t is A =12t + 18t^2 . Hence find the rate of change of the area at the instant when
t = 2.
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