
Concept explainers
END OF THE IPOD ERA Apple introduced the first iPod in October 2001. Sales of the portable music player grew slowly in the early years but began to grow rapidly after 2005. But the iPod era is coming to a close. Smartphones with music and video players are replacing the iPod, along with the category of device it helped to create. Sales of the iPod worldwide from 2007 through 2011 (in millions) were approximately
N(t) = −165t2 + 13.13t + 39.9 (0 ≤ t ≤ 4)
in year t, where t = 0 corresponds to 2007. Show that the worldwide sales of the iPod peaked sometime in 2009. What was the approximate largest number of iPods sold worldwide from 2007 through 2011?

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Chapter 4 Solutions
Bundle: Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach, 10th + WebAssign Printed Access Card for Tan's Applied ... A Brief Approach, 10th Edition, Single-Term
- Graph y=log2(x+3) 10+ 9 8 7- 6 5 4 3 3 2 1 10 -9 -8 -7 -6 -5 -4 -3-2-1 1 2 3 4 5 6 7 8 7 8 9 10 -1 -2 -3 -4 -5 -6 -7- -8 -9 -10 Clear All Drawarrow_forwardWrite an equation for the graph below. +10+ 9 10 -9 -8 -7 -6 -5 -4 -3-2-1 8 7 6 5 4 3 2 1 1 3 4 5 6 7 8 9 10 -1 -2 -3 -4 -5 -6 -7 -8 f(x) = 9 -9 -10-arrow_forward3. Solve the inequality and give your answer in interval notation. Be sure to show all your work, and write neatly so your work is easy to follow. (4 points) 2|3x+12 ≥ 18arrow_forward
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- "Use the Opposite Method to solve the following differential equation:" 4'"""" + 34" + 34 + 4 = xarrow_forwardFor the curve defined by (t) = (e cos(t), et sin(t)) find the unit tangent vector, unit normal vector, normal acceleration, and tangential acceleration at πT t = 3 П I(3) 丌_3_3 N (1) ат aN || = = =arrow_forwardFind the velocity vector for the position vector (t) = (sin(9+), 9t10, e¯7). x component = y component = Z component =arrow_forward
- In the xy-plane, an angle 0, in standard position, has a measure of the following is true? T. Which of 3 A The slope of the terminal ray of the angle is 1. B The slope of the terminal ray of the angle is 1. C D 3 The slope of the terminal ray of the angle is ✓ 2 The slope of the terminal ray of the angle is √3.arrow_forwardy'''-3y''+4y=e^2x Find particular solutionarrow_forward1 -1- Ο Graph of f y = + y = 1 + 1/2 ·2· x Graph of g y = 1- 플 The figure gives the graphs of the functions f and g in the xy-plane. The function of is given by f(x) = tan¹ x. Which of the following defines g(x)? A tan 1 x + 1 B - tan 1 x + П 2 C tan-1 (2/2) + 1 D tan-1 (2/2) + 1/1arrow_forward
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