Two small speakers emit sound waves of different frequencies equally in all directions. Speaker A has an output of $0\mathrm{.}900mW,$ and speaker $B$ has an output of $1\mathrm{.}80mW.$

$($a$)$ Determine the sound level $($in decibels$)$ at point $C$ assuming only speaker A emits sound. $dB$

$($b$)$ Determine the sound level $($in decibels$)$ at point $C$ assuming only speaker $B$ emits sound. $dB$

$($c$)$ Determine the sound level $($in decibels$)$ at point $C$ assuming both speakers emit sound. $dB$

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