What is the interquartile range for the numbers 4,3,2,3,5,7,2,1

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'