Maria has two electronic beepers. one of them beeps every 4 seconds; the other beeps every 9 seconds. if they are turned on at exactly the same time, how many times during the next hour will both beepers beep at the same time?

What are three voluntary behaviors that is not control by results?

Because of the housing bubble, many houses are now selling for much less than their selling price just two to three years ago. there is evidence that homeowners with virtually identical houses tend to ask for more if they paid more for the house. what fallacy are they making?

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?