The number of Facebook members from the start of 2006 to mid-2008 can be approximated by S(t) = 15t - 76t + 101 million members (2 s t s 4.5) in year t (t = 0 represents the start of 2004).+ Facebook membership (millions) 60 40 20 0 2 3 2006 2008 (a) Compute S'(t), S'(t) = According to the model, how fast was Facebook membership changing at the start of 2008 (t = 4)? (Be careful to give correct units of measurement.) 5'(4) - million members per year (b) According to the model, Facebook memberships did which of the following? O increased at a slower and slower rate during 2008 (the interval [4, 5]) decreased at a faster and faster rate during 2008 (the interval [4, 5]) O decreased at a slower and slower rate during 2008 (the interval [4, 5]) O increased at a faster and faster rate during 2008 (the interval [4, 5]) Need Help