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:
6
Step-by-step explanation:
I think so 6 because I think so
Answer:
3
Step-by-step explanation:
Answer:
79
Step-by-step explanation:
first sub in 24 into the d (days)
then solve for L (length) from there with addition.
hope this helps!!