The following are the ages (years) of 5 people in a room:
18, 22, 18, 25, 25
A person enters the room.
The mean age of the 6 people is now 23.
What is the age of the person who entered the room?

Lesson 9-3 for items 8-10, a square is drawn in the coordinate plane, with vertices as shown in the diagram. then the square is reflected across the x-axis. -2 4 8. the function that describes the reflection is (x, y) - a. (x, y-3). b. (x, y-6). c. (-x, y). d. (x,- y).