The rule is to evaluate terms according the following order of priority:
In UK it is BIDMAS, an acronym for Brackets, Index, Division, Multiplication, Addition and Subtraction.
In US, it is PEMDAS = Parentheses, Exponent, Multiplication, Division, Addition and Subtraction order of the mathematical order of operations."
Note, that multiplication and division have the same priority; also, addition and subtraction have the same priority.
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Whenever evaluating expressions that do not have parentheses (brackets) nor indices.
An algebraic expression is a process for evaluating expressions. Replacing variables with numerals and following a standard order of operations is used for the process.
It is "evaluating".
formula expression
It means finding the value of the expression.