Roland invests $12000 in an account that pays compound interest at a rate of 2.2% per year

Me figure out the process to determine x you appreciate it : )

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?

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01