Suppose demand is given by the equation: 
At what point along this demand curve will total revenue be maximized?
Definitions:
Pulmonary Function
The capability of the lungs to exchange oxygen and carbon dioxide efficiently, often measured by specific tests.
Oxygen
is a chemical element with symbol O, essential for most life on Earth, particularly for the process of cellular respiration.
Carbon Dioxide
A gas that is transparent and lacks smell, created during the burning of organic materials and the process of respiration.
Cell Membrane
The semipermeable membrane surrounding the cytoplasm of a cell, controlling the movement of substances in and out.
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