If a is to the right of b on a number line, which of the following must be true?

Which expression is equivalent to? assume x > 0 and y > 0.

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?

When only separate discreet points are graphed it is called?