Job Outlook. Excellent. Respiratory therapists provide care and treatment for patients suffering from breathing and cardiopulmonary difficulties. They may also provide emergency medical care for patients who have experienced asphyxiation, heart attacks, or shock.
0 is a number alone or not. if you put 0 by itself its both a number and a digit.
A zero pair describes a pair of numbers whose sum equals zero. One number in this equation will always have a positive sign, while the other number will always have a negative sign.