free points talk and chill in the comments happy Saturday need to go back in the question its on mathematics

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?

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25