Mobile Instant Messaging Accounts Mobile instant messaging (IM) is a small portion of total IM usage, but it is expected to grow sharply. The function P(t) = 0.257t2 + 0.57t + 3.9 (0 sts 4) gives the project mobile IM accounts in year t as a percentage of total enterprise IM accounts from 2006 (t = 0) through 2010 (t = 4).t (a) What percentage of total enterprise IM accounts were the mobile accounts in 2009? % (b) How fast was this percentage expected changing in 2009? % per year

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