That sounds like the description of an "expression", except for one detail: an expression MAY have operations, but also, it may not, since numbers and variables are themselves expressions.
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It is called an expression.
An expression.
Nothing, because they cannot. You need at least a pair of data for two variables before correlation can be calculated. That means at least four numbers.
An algebraic expression can have a mixture of numbers and variables, but it does not contain an equals sign.
TRUE