Answer:
I believe the answer is B, and the other answer is D.
The dot on -1 is open, so the number -1 is not included. You need all real numbers greater than -1.
Answer: 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:
last one
Step-by-step explanation:
Answer:
8
Step-by-step explanation: