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

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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 word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer