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.
Similarly, a number times 0 is 0 because multiplication by an integer can be thought of as repeated addition, and adding the number zero times leaves you with the additive identity, which is 0. For other ways of seeing why the answer is 1, see Why does a number raised to the zeroth power equal one?