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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem
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The table gives the number N ( t ) , measured in thousands, of minimally invasive cosmetic surgery procedures performed in the United States for various years t.

t N(t) (thousands)
2000 5, 500
2002 4, 897
2004 7, 470
2006 9, 138
2008 10, 89
2010 11, 561
2012 13, 035

Source: American Society of Plastic Surgeons

(a) What is the meaning of N ( t ) ? What are its units?

(b) Construct a table of estimated values for N ( t ) .

(c) Graph N and N .

(d) How would it be possible to get more accurate values for N ( t ) ?

(a)

To determine

To write:

the meaning of  N'(t).

The meaning of N't is the rate of change of cosmetic surgery procedures with respect to time. And its unit is number of surgery procedures (in thousands) per year.

(b)

To find:

Table of N't

t N(t)  (in thousands) N't
2000 5500  -301.5
2002 4897         1286.5
2004 7470       834
2006 9138 879.5
2008 10897 332
2010 11561 737
2012 13035

Explanation:

Formula:

N't   = Nt+h   -Nth, taking h = 2

Given: The table of Nt is given

Calculation:

We can find the values of N't by using the rate of change formula N't= Nt+h   -Nth

Where t = time is years and h = change in years

N'2000= N2002-N(2000)2=-301.5

N'2002= N2004-N(2002)2=1286.5

N'2004= N2006-N(2004)2= 834

N'2006= N2008-N(2006)2=879.5

N'2008=  N2010  - N(2008)2  = 332

N'2010= N2012-N(2010)2= 737

(c)

To graph:

N(t) and N’(t) versus t

Calculus (MindTap Course List), Chapter 2.2, Problem 34E , additional homework tip  1

Graph of N'(t)

Calculus (MindTap Course List), Chapter 2.2, Problem 34E , additional homework tip  2

(d) To explain:

how will you be able to find accurate values of N(t).

In part (b) we have calculated average rate of change in Nt.  To get more accurate value of N'(t) using the given data, we may compute two different values of rate of change for each year by using the  two different values for h namely h = 2 and h = -2, and take average of both values. Notice that this cannot be done at the end points.Thus N't   = 1/2(Nt+2   -Nt2 +Nt-2   -Nt-2 )

A more correct approach would to be sub divide the time to as small units as possible. But we do not have that data.

Explanation

Formula:

N't   = Nt+h   -Nth, taking h = 2

Given: The table of Nt is given

Calculation:

We can find the values of N't by using the rate of change formula N't= Nt+h   -Nth

Where t = time is years and h = change in years

N'2000= N2002-N(2000)2=-301.5

N'2002= N2004-N(2002)2=1286.5

N'2004= N2006-N(2004)2= 834

N'2006= N2008-N(2006)2=879

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