Two airplanes take off from an airport at the same time. One travels on a heading of 45 degrees at 420 mph and the other on a heading of 150 degrees at 400 mph. After two hours, how far apart are the airplanes?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?