Solve for N , I can’t get this , I’ll give brainliest to who gets it!!!

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

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?

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.