please complete both a and b. i have the answer for a but i dont know how to do it. thank you.

4. The formula B = 10 log(7) can be used to calculate the sound level, B decibels, where / is the intensity of the sound and /, is a reference intensity equal to 10""W/m . A conversation between two people is approximately 60 dB, while the threshold of pain caused by sound is considered to be 130 dB. a. Determine how many times as intense the threshold of pain is than a conversation. the answer for you is Please show the work 60 - log C+ be Determine the sound level to the nearest tenth of a decibel if the conversation intensity is OG frippled