Determine the INTENSITY of the SOUND??!!

A sound is heard at a level of 36dB at a distance of 3m away from the source. Determine the intensity of the sound (in dB) at a distance of 34m away. Assume the sound spreads out equally in all directions.

Answer: 3.8x10^(1)dB

Please explain in detail thank you :)

d2^2 * 10^(dB2/10) = d1^2 * 10^(dB1/10)
dB2 = 20log(d1 / d2) + dB1
dB2 = 20log(3 / 34) + 36
dB2 = 14.91 dB <===ans (not the same as yours)