Solve the differential equation. 
Definitions:
Token Economy
A behavior modification system that utilizes tokens as reinforcing stimuli which can be exchanged for desired rewards.
Systematic Desensitization
Systematic Desensitization is a behavior therapy technique used to reduce phobic disorders by gradually exposing the person to the anxiety-producing stimulus in a controlled manner.
Client-centered Therapy
A psychotherapeutic approach developed by Carl Rogers, emphasizing unconditional positive regard, empathy, and genuineness in the therapeutic relationship to facilitate client growth.
Aversive Conditioning
A form of behavioral training in which noxious stimuli are associated with undesirable behaviors to reduce their occurrence.
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