Someone pl help me to solve my question

With: label the vertices and all the elements needed. find x

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?

Nine more than four times a number is the same as one less than twice the number. find the number?