The table below shows the relationship between the number of times you get your car washed each month and your total monthly benefit from car washes.Each car wash costs $15. 
What's the average benefit of 4 car washes per month?
Definitions:
Bronchi
The main passageways directly attached to the trachea that carry air in and out of the lungs.
Pneumothorax
A medical condition where air enters the space between the lung and chest wall, causing the lung to collapse.
Pneumonitis
Inflammation of lung tissue that is not caused by infection.
-osis
A suffix used in medical terminology to denote a condition, disease, or increase.
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