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3.3 Rates of Change and Behavior of Graphs

Average rate of change across an interval, plus reading intervals of increase and decrease and local versus absolute extrema straight off a graph.

Algebra and Trigonometry 2e, 3.3 Rates of Change and Behavior of Graphs

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28 exercises

Computing an Average Rate of Change

Using the data in the table, find the average rate of change of the price of gasoline between 2007 and 2009.

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3.3 Exercise 7

Using the data in the table, find the average rate of change between 2005 and 2010.

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Computing Average Rate of Change from a Table

After picking up a friend who lives 10 miles away and leaving on a trip, Anna records her distance from home over time. The values are shown in the table. Find her average speed over the first 6 hours.

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Computing Average Rate of Change for a Function Expressed as a Formula

Compute the average rate of change of f( x )= x 2 − 1 x f \left(x\right) = x^{2} - \frac{1}{x} on the interval [2,4]. [\text{2}, \text{4}].

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3.3 Exercise 11

Find the average rate of change of f( x )=x−2 x f \left(x\right) = x - 2 \sqrt{x} on the interval [1,9]. \left[1 , 9\right] .

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Finding the Average Rate of Change of a Force

The electrostatic force F, F , measured in newtons, between two charged particles can be related to the distance between the particles d, d , in centimeters, by the formula F( d )= 2 d 2 . F \left(d\right) = \frac{2}{d^{2}} . Find the average rate of change of force if the distance between the particles is increased from 2 cm to 6 cm.

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Finding an Average Rate of Change as an Expression

Find the average rate of change of g( t )= t 2 +3t+1 g \left(t\right) = t^{2} + 3 t + 1 on the interval [0,a]. \left[0 , a\right] . The answer will be an expression involving a a in simplest form.

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3.3 Exercise 14

Find the average rate of change of f(x)= x 2 +2x−8 f \left(x\right) = x^{2} + 2 x - 8 on the interval [5,a] \left[5 , a\right] in simplest forms in terms of a. a .

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3.3 Exercise 20

Can the average rate of change of a function be constant?

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3.3 Exercise 22

How are the absolute maximum and minimum similar to and different from the local extrema?

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3.3 Exercise 24

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

f( x )=4 x 2 −7 f \left(x\right) = 4 x^{2} - 7 on [1,b] \left[1 , b\right]

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3.3 Exercise 26

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

p( x )=3x+4 p \left(x\right) = 3 x + 4 on [2,2+h] \left[2 , 2 + h\right]

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3.3 Exercise 28

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

f( x )=2 x 2 +1 f \left(x\right) = 2 x^{2} + 1 on [x,x+h] \left[x , x + h\right]

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3.3 Exercise 30

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

a( t )= 1 t+4 a \left(t\right) = \frac{1}{t + 4} on [9,9+h] \left[9 , 9 + h\right]

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3.3 Exercise 32

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

j( x )=3 x 3 j \left(x\right) = 3 x^{3} on [1,1+h] \left[1 , 1 + h\right]

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3.3 Exercise 34

Find the average rate of change of each function on the interval specified for real numbers b b or h h in simplest form.

Find f( x+h )−f( x ) h \frac{f \left(x + h\right) - f \left(x\right)}{h} given f( x )=2 x 2 −3x f \left(x\right) = 2 x^{2} - 3 x on [x,x+h] \left[x , x + h\right]

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3.3 Exercise 36

Estimate the average rate of change from x=2 x = 2 to x=5. x = 5.

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3.3 Exercise 42

Estimate the point(s) at which the graph of f f has a local maximum or a local minimum.

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3.3 Exercise 44

If the complete graph of the function is shown, estimate the absolute maximum and absolute minimum.

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3.3 Exercise 46

the table gives the population of a town (in thousands) from 2000 to 2008. What was the average rate of change of population (a) between 2002 and 2004, and (b) between 2002 and 2006?

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3.3 Exercise 48

Find the average rate of change of each function on the interval specified.

h( x )=5−2 x 2 h \left(x\right) = 5 - 2 x^{2} on [−2,4] \left[−2 , \text{4}\right]

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3.3 Exercise 50

Find the average rate of change of each function on the interval specified.

g( x )=3 x 3 −1 g \left(x\right) = 3 x^{3} - 1 on [−3,3] \left[−3 , \text{3}\right]

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3.3 Exercise 52

Find the average rate of change of each function on the interval specified.

p( t )= ( t 2 −4 )( t+1 ) t 2 +3 p \left(t\right) = \frac{\left(t^{2} - 4\right) \left(t + 1\right)}{t^{2} + 3} on [−3,1] \left[−3 , \text{1}\right]

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3.3 Exercise 54

Use a graphing utility to estimate the local extrema of each function and to estimate the intervals on which the function is increasing and decreasing.

f( x )= x 4 −4 x 3 +5 f \left(x\right) = x^{4} - 4 x^{3} + 5

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3.3 Exercise 56

Use a graphing utility to estimate the local extrema of each function and to estimate the intervals on which the function is increasing and decreasing.

g( t )=t t+3 g \left(t\right) = t \sqrt{t + 3}

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3.3 Exercise 58

Use a graphing utility to estimate the local extrema of each function and to estimate the intervals on which the function is increasing and decreasing.

m( x )= x 4 +2 x 3 −12 x 2 −10x+4 m \left(x\right) = x^{4} + 2 x^{3} - 12 x^{2} - 10 x + 4

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3.3 Exercise 62

Let f( x )= 1 x f \left(x\right) = \frac{1}{x} . Find the number b b such that the average rate of change of f f on the interval (2,b) \left(2 , b\right) is − 1 10 . - \frac{1}{10} .

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3.3 Exercise 64

A driver of a car stopped at a gas station to fill up their gas tank. They looked at their watch, and the time read exactly 3:40 p.m. At this time, they started pumping gas into the tank. At exactly 3:44, the tank was full and the driver noticed that they had pumped 10.7 gallons. What is the average rate of flow of the gasoline into the gas tank?

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.