Nevermind, I was able to solve it. --- 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!