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.
1 Zeros between non-zero digits are significant. 2  Leading zeros are never significant. 3  In a number with a decimal point, trailing zeros, those to the right of the first non-zero digit, are significant. 4  In a number without a decimal point, trailing zeros may or may not be significant.