Answer: I dont know the answer but i did some research and i got you some notes i hope they help!
Step-by-step explanation: :D
Answer:

Step-by-step explanation:
From the question we are told that:
Loudness function 
Sound of a person 
Number of persons talking 
Generally the Relative intensity for 20 people is mathematically given by
Relative intensity for

Relative intensity for

Generally the loudness for 20 people is mathematically given by




Therefore increase in loudness X is given as


Answer: The identity is verified. See the explanation.
Step-by-step explanation:
You must keep on mind the following identities:

Therefore, by substitution, you can rewrite the identity as shown below:

Simpliying, you obtain:

The identity is verified.
Answer:
Step-by-step explanation:
1 ring has a radius of 3 feet
1 ring has a circumfrence of 2*pi*r = 2 * 3.14 * 5 = 10*Pi
5 rings would have a length of 50 * pi length = 50*3.14 = 157 feet
That's a lot of Brillo pads.