A person invested $8,700 in an account growing at a rate allowing the money to double every 15 years. How long, to the nearest tenth of a year would it take for the value of the account to reach $23,100?

How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

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?

X2 + y 2 = 36 x + y = 6 solve the system of equations.