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Applied Calculus for the Manageria...

10th Edition
Soo T. Tan
ISBN: 9781285464640

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BuyFindarrow_forward

Applied Calculus for the Manageria...

10th Edition
Soo T. Tan
ISBN: 9781285464640
Textbook Problem

Mobile DEVICE Usage The average time U.S. adults spent per day on mobile devices (in minutes) for the years 2009 through 2012 is approximated by

f(t) = 2.25t2 + 13.41t + 21.76 (0 ≤ t ≤ 3)

where t = 0 corresponds to 2009.

  1. a. What was the average time U.S. adults spent per day on mobile devices in 2009?
  2. b. If the trend continued through 2013, what was the average time U.S. adults spent per day on mobile devices in 2013?

(a)

To determine
The average per day time spent by U.S. adults on mobile devices in 2009.

Explanation

Given information:

Approximate time for the years 2009 to 2013 is,

f(t)=2.25t2+13.41t+21.76(0t3)

The value of t is 0 for 2009.

Calculation:

The given function is,

f(t)=2

(b)

To determine
The average per day time spent by U.S. adults on mobile devices in 2013.

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