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.
Before then, mathematicians struggled to perform the simplest arithmetic calculations. Today, zero â both as a symbol (or numeral) and a concept meaning the absence of any quantity â allows us to perform calculus, do complicated equations, and to have invented computers.