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.
Rules. 1  All non-zero digits are significant. For example: 2  Zeros between non-zero digits are significant. For example: 3  Zeros to the left of the first non-zero digit are not significant. For example: 4  If a number ends in zeros to the right of the decimal point, those zeros are significant. For example: 2.0 (2 sig figs) 2.00 (3 sig figs) {This signifies greater accuracy.}. If a number ends in zeros to the left of the decimal point, those zeros may or may not be significant.