In a small country, the demand and supply of kidneys are represented by QD = 10,000 - 0.25P and QS = 0.5P + 4,000. Which of the following statements is (are) TRUE? 
Definitions:
Erroneous Mark
A mark or notation that is made by mistake or is incorrect.
Precordial Electrode
Precordial electrodes are used in electrocardiography (EKG/ECG), placed on the chest area to record heart’s electrical activity from different angles.
Intercostal Space
The physical space between two ribs, which contains muscles, nerves, arteries, and veins.
Middle of the Armpit
The central region within the armpit area, anatomically known as the axilla.
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