The graph of the derivative 
of a continuous function f is shown.On what intervals is f decreasing? 
.
Definitions:
Characteristics
Distinctive traits, qualities, or properties that identify and differentiate an individual, object, or concept.
Social Groups
Clusters of individuals who interact with each other and share similar characteristics or a sense of unity.
Nationality
The status of belonging to a particular nation, either by birth or naturalization, indicating a person's legal relationship with a state.
Gender
The range of characteristics pertaining to, and differentiating between, masculinity and femininity.
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