Speakers sound level at a certain point.

[Lipd]

Nevermind, I was able to solve it.
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Two small speakers emit spherical sound waves of different frequencies. Speaker A has an output of 1.00 mW and speaker B has an output of 1.50 mW. Determine the sound level (in decibels) at point C if a) only speaker A emits sound, b)only speaker B emits sound, c) both speakers emit sound.
The attachment has the distances and arrangement of the speakers and the point c.
Any help is much appreciated, thanks!

[HallsofIvy]

The "1.00 Mw" and "1.5 Mw" tell you the strength. Like anything else that expands "spherically", sound obeys an inverse square law.
The intensity of the sound is S/r2 where S is the strength of the sound and r is the distance from the point to the speaker. You will have to calculate that for each speaker and then add.