Atriangle has side lengths of 20 cm 27 cm and 21 cm. is the triangle a right triangle? show your work to pro ve it!

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?

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.

At a soccer tournament 1212 teams are wearing red shirts, 66 teams are wearing blue shirts, 44 teams are wearing orange shirts, and 22 teams are wearing white shirts. for every 22 teams at the tournament, there is 1 team wearing shirts. choose 1