Suppose demand is given by the equation: 
Using the midpoint method, what is the price elasticity of demand between $2 and $4?
Definitions:
Fibrous Connective Tissue
A type of connective tissue characterized by a high density of collagen fibers, providing strength and flexibility to structures such as tendons and ligaments.
Alveolar Walls
The thin barriers in the lungs that separate the air in the alveoli from the blood in surrounding capillaries, facilitating gas exchange.
Vital Capacity
The maximum amount of air a person can exhale after a maximum inhalation, used to assess the health of respiratory systems.
Expiratory Reserve
The volume of air that can be forcefully exhaled after the end of a normal tidal expiration.
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