19) The student body of 55 students wants to elect a president, vice president, secretary,
and treasurer.

Find the number of possibilities

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?

An angle that measures between 90 and 180° is called a(,

Here is my question! jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?