Hm Every hour, a research assistant removes half the mass of a bacteria culture originally Wayne 4800 µg to observe under a microscope. The research assistant will stop this process once the mass is equal to 300 µg.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.