The general formula for determining a rate is the ratio of the number of times something happens to the number of times it could happen.

In many medical offices, ________ are used in conjunction with a computer for letter-quality printing

a. copy machines b. fax machines c. scanners d. color laser printers

What is the average total work of breathing for healthy persons?

a. 0.31 to 0.2 J/L b. 0.3 to 0.5 J/L c. 0.5 to 0.8 J/L d. 0.8 to 1.5 J/L