Calculate the amount of oxygen needed to support 20 humans over 24 hours on Mars

What claim did thorne make? what evidence supported his claim?

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

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?