Jacinth is 4 years older than her sister Naomi. The sum of their ages is 30. How old are the sisters?

Find the sum of the following series. round to the nearest hundredth if necessary.

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 appliance store sells lamps at $95.00 for two. a department store sells similar lamps at 5 for $250.00. which store sells at a better rate