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])

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])

Calculus: Early Transcendentals

8th Edition

ISBN:9781285741550

Author:James Stewart

Publisher:James Stewart

Chapter1: Functions And Models

Section: Chapter Questions

Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.

Question

iPhone sales from the 2nd quarter in 2007 through the 2nd quarter in 2008 can be approximated by
S(t) = -390t + 3,300t -
4,800 thousand phones (2 <t < 6)
%3D
in quarter t. (t 1 represents the start of the first quarter of 2007.)t
%3D
iPhone sales (thousands)
2,000
1,500
1,000
500
0.
1.
2.
4
9.
2007 Q2
2008 Q2 1
(a) Compute S'(t).
S'(t) =
(1),S
How fast were the iPhone sales changing in the second quarter of 2008 (t = 6)? (Be careful to give correct units of
measurement.)
%3D
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])
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])
O decreased at a slower and slower rate during 2007 (the interval [2, 4])
3.

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