Answer:
there are 300 people in the enclosed space
initially one person had heard the rumor.
Step-by-step explanation:

Here top number represents the number people in the enclosed space
So, there are 300 people in the enclosed space
t= 30 minutes
Plug in 30 for t then N(30) becomes

So second option is not correct
To find initial number of persons we plug in 0 for t


So initially one person had heard the rumor.