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What is a combinations of numbers variables and operations?
It is an expression.
What is it when you substitute numbers in for the variables and follow the order of operations?
It is evaluating the expression.
What is an expression that contains numbers operations and one or more variables?
That sounds like the definition for Recursive Formula.
What is the difference between an open sentence and an expression?
An open sentence is a mathematical statement with variables that can be true or false depending on the values assigned to the variables. An expression, on the other hand, is a mathematical phrase that combines numbers, variables, and operations but does not contain an equal sign, so it does not represent a relationship or a statement. In simpler terms, an open sentence is like a question that can be answered, while an expression is like a calculation that can be simplified.
What do algebraic expression contains?
Constants (numbers), variables, the four basic operations of arithmetic (+, -, *, /) as well as brackets and indices (including negative and fractional ones).
