Can someone help with this

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?

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal