Find the midpoint of a line with endpoints of (2, 6) and (10, 18)

Find the value of x for which abcd must be a parallelogram -9-6x x-30

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?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)