Great plans to evaporate enough water from 22 gallons of a 16% ammonia solution to make a 24% ammonia solution M

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?