Answer:
The age of the person who entered the room is 15
Step-by-step explanation:
We are given:
Ages of 5 people in a room are:
17, 16, 15, 17, 22
A person enters room, and then the mean age of 6 people is 17.
We need to find the age of person who entered the room.
The formula to calculate mean is: 
Now, in question we are given mean of 6 people that is 17
The age of 5 people are given while age of one person who enters the room is unknown.
Let age of person whose age is unknown= x
Now finding x using mean formula

So, The value of x: x=15
Hence, the age of the person who entered the room is 15
Answer:
DO YOU STILL NEED HELP?
Step-by-step explanation:
The shortest distance between 2 concentric circles is the difference of their radii. Thus the answer is 8-2=6
Sry but I don’t know the answer I just have two answer 2 questions so I don’t have to watch a video
Answer:
3/4 or 0.75
Step-by-step explanation: