Use a calculator to compute the determinant of the matrix. If the determinant is zero, write singular matrix. If the determinant is nonzero, find A-1. 
Definitions:
Droplet Contact
A mode of disease transmission via large respiratory droplets expelled when an infected person coughs or sneezes.
Oral Mucosa
The moist lining of the oral cavity, which includes the lining of the mouth and the gums.
Sexual Contact
Any form of physical interaction that is sexual in nature, ranging from touching to intercourse.
Cough Etiquette
Practices aimed at preventing the spread of germs, such as covering the mouth and nose with a tissue or elbow when coughing or sneezing.
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