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.
All zeros between non-zero digits are significant. Ignore the decimal point, if necessary. For example, the number 305 also has three significant figures. So does 3.05, because the zero is between non-zero digits. Zeros at the beginning of a decimal number or at the end of a large number are not significant. For example, 546,000 has only three significant figures. The three zeros simply serve to put the 5 in the 100,000s place, and the 6 in the 1000s place.