The number (n) of members of an AFL football club increases over time (t weeks) according to the rule n = -3t(t - 30), . a        Find the average rate of increase in membership in the third week, i.e. from t = 2 to t = 3. b        If the club sells 10 memberships on the first day of the fourth week, estimate the rate of change of the club’s membership at the end of the third week.

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