1. write a mathematical expression that explains the following sentence: The sum of 4 and d, then multiply the result by 2

Evaluate the following expression 1/3^2

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?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*