A researcher wants to determine what percent of all first graders who believe unicorns are real. She obtains a database of all current first graders in the USA, and sorts the database by the county in which the child attends school. She randomly selects 25 counties, and includes all first graders in each of them to form her sample. The sampling technique used by this researcher is:

Someone answer this asap for gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a. gabriella averages 7.5 u.s. dollars for every 100 euros. b. gabriella averages 100 u.s. dollars for every 25 euros. c. gabriella can exchange 75 u.s. dollars for 100 euros. d. gabriella can exchange 100 u.s. dollars for 75 euros.