IM TAKING A TEST HELP

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?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.