12. What is the probability of a girl being born after four boys have already been born in a family?

What organelle other than the nucleus houses dna in a eukaryotic cell?

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According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?