iPhone sales from the 2nd quarter in 2007 through the 2nd quarter in 2008 can be approximated by S(t) = -390t2 + 3,300t - 4,800 thousand phones (2 sts 6) %3D in quarter t. (t = 1 represents the start of the first quarter of 2007.)t iPhone sales (thousands) 2,000 1,500 1,000 500 3. 4 6. 2007 Q2 2008 Q2 O (a) Compute S'(t). S'(t) = How fast were the iPhone sales changing in the second quarter of 2008 (t = 6)? (Be careful to give correct units of measurement.) %3! S'(6) thousand phones per quarter %3D (b) According to the model, iPhone sales did which of the following? O decreased at a faster and faster rate during 2007 (the interval [2, 4]) O increased at a slower and slower rate during 2007 (the interval [2, 4]). increased at a faster and faster rate during 2007 (the interval [2, 4]) decreased at a slower and slower rate during 2007 (the interval [2, 4])

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