The mean age of 5 people in a room is 36 years. A person enters the room. The mean age is now 39. What is the age of the person who entered the room?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )