How do i evaluate expressions?

To evaluate expressions, first identify the mathematical operations involved, such as addition, subtraction, multiplication, and division. Follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)). Substitute any variables in the expression with their numerical values if provided. Finally, perform the calculations step by step to arrive at the final result.