Anna experienced extreme pain at the dentist as a child. Now she goes to a different dentist, but feels her heart race when she arrives, and go down when she leaves. Her heart racing whenever she goes to the dentist is due to , and the calming feeling when she leaves is due to

Classical conditioning, Operant conditioning

Explanation:

The reason is that classical conditioning is the form of learning which creates a perception about a matter due to past experience. This perception in this case is extreme pain and once she is operated she feels very calm because the pain she perceived associated with the dentist operating has ended so from her perspective this is was a sort of punishment and now she is done with it. The flow of feeling after bearing the pain associated with the task perceived is operant conditioning.

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answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;