34h ^ 2 * j ^ 2 * k ^ 7 - 2h ^ 2 * j ^ 2 * k

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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?

Can someone me with this problem i don't understand i need