The expression m+n represents the sum of two variables, m and n . In mathematics, variables are symbols used to represent numbers that can change or vary. This expression is commonly used in algebra to perform addition, which is one of the basic arithmetic operations. When you add m and n , you combine their values to find a total. For example, if m equals 3 and n equals 5, then m+n equals 8. This concept is fundamental in various fields, including mathematics, science, and finance, where combining quantities is often necessary.