Why would it be useful for a house to have sound-absorbing materials in the walls

Hey,

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The house needs sound absorbing materials in the walls so that reveberation  dosen't happens and can here clearly what people will be saying in the house

It is also used in cinema halls also

I believe that this answer was heplful.

the inner core.

good luck: )

klicker

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form