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4th Edition

James Stewart

Publisher: Cengage Learning

ISBN: 9781337687805

Chapter 2.7, Problem 42E

To determine

**To Identify:** The curves

Expert Solution

In the given graph,

**Graph:**

The given graph is shown as in Figure 1,

**Observation:**

Observe the graph of *c* and *d* carefully.

The point where

Recall that the derivative of a function is zero where the function has a horizontal tangent.

Thus,

Observe the graph of *b* and *c* carefully.

The slope of *c* has negative value when *b* has negative value when *c* has positive value when *b* has positive value when

Thus,

Observe the graph of *b* and *a* carefully.

The slope of *b* has positive value when *a* has positive value when

Thus,

From (1), (2) and (3), it is concluded that,

Thus,