A bag contains the following marbles: 5
black marbles, 15 blue marbles, 20 brown marbles, and 10 green marbles. What is the ratio of brown marbles to black marbles? Express your ratio as a fraction or with a colon.

Adoctor administers a drug to a 38-kg patient, using a dosage formula of 50 mg/kg/day. assume that the drug is available in a 100 mg per 5 ml suspension or in 500 mg tablets. a. how many tablets should a 38-kg patient take every four hours? b. the suspension with a drop factor of 10 ggt/ml delivers the drug intravenously to the patient over a twelve-hour period. what flow rate should be used in units of ggt/hr? a. the patient should take nothing pills every four hours. (type an integer or decimal rounded to the nearest hundredth as needed.)

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?