Question: (a) Using Table 2.10, calculate the average rate of change of the number of Facebook users, N (in millions), per month for each of the
(a) Using Table 2.10, calculate the average rate of change of the number of Facebook users, N (in millions), per month for each of the 3-month intervals.
(b) What can you say about the sign of d2N∕dt2 during the period September 2014–September 2015?

Table 2.10 Month, 1 Sep 2014 N 1350 Dec 2014 Mar 2015 June 2015 Sep 2015 1393 1441 1490 1545
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