Solve a triangle rectangle knowing the hypotenuse is 415 meters and one of the axes is 280 meters

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?

What could explain what happened when the time was equal to 120 minutes

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year