EBK PRECALCULUS W/LIMITS
EBK PRECALCULUS W/LIMITS
3rd Edition
ISBN: 9781285607160
Author: Larson
Publisher: CENGAGE CO
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Concept explainers

Rate of Change
The relation between two quantities which displays how much greater one quantity is than another is called ratio.
Slope
The change in the vertical distances is known as the rise and the change in the horizontal distances is known as the run. So, the rise divided by run is nothing but a slope value. It is calculated with simple algebraic equations as:
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Question
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Chapter 5.3, Problem 91E
To determine

The months in which sales exceed 7500 units

Expert Solution & Answer
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Answer to Problem 91E

January,November and December

Explanation of Solution

Given:The monthly sales S(in hundred of units)of skiing equipment at the sports store approximated byS=58.3+32.5cosπt6

Where t is the time (in months)with t =1 corresponding to January. Determine The months in which sales exceed 7500 units

The given equation is

  y1=58.3+32.5cosπt6y2=75

Where t is the time

The graph of the equation is

EBK PRECALCULUS W/LIMITS, Chapter 5.3, Problem 91E

From the graph it is concluded that

Left point of intersection (1.95,75)

Right most point of intersection (10.049,75)

So the sales exceed 7500 units in 1st ,11th,12th month

i.e

January,November and December

Hence ,The sales exceed 7500 units in January,November and December

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Chapter 5.3, Problem 90E
Next
Chapter 5.3, Problem 92E

Chapter 5 Solutions

EBK PRECALCULUS W/LIMITS

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