You multiply force times friction
If the soloist produces "x" decibels and the 10-person choir produces "y" decibels, combined they will produce "x+y" decibels.
The second choir has 90 additional singers, we base our description on the first choir. If a 10-person choir produces "x+y" decibels, then the 90 person choir produces 10 (x+y) decibels.
D. According to the hierarchy of needs the body and mind must be taken care of first and foremost.
Yes, <span> the moon fall partly into earth's shadow when it is in its full size</span>