Solve the following equation. Be sure to check each answer in the original equation if you multiply both sides by an expression that contains the variable. 
Definitions:
Blood CO2 Levels
The concentration of carbon dioxide in the blood, which is critical for maintaining the body's acid-base balance.
Respiratory Variables
Measurements and factors that characterize the functioning of the respiratory system, such as lung volume and breathing rate.
Minute Respiratory Volume (MRV)
This refers to the total volume of gas that is inhaled or exhaled from a person's lungs in one minute.
Expiratory Reserve Volume (ERV)
The extra volume of air that can be expelled with force following a regular, gentle breath out.
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