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Answer:
. This is from my own understanding
1. A symbol •usually letter•standing in for an unknown numerical value in an equation.
2. Is a key number whose value is fixed by an ambiguous definition, often reffered as a symbol.
3. •equation poba yung isa?• an expression is a number, a variable, or a combination of variables and operation symbols,an equation is made up of two expressions connected by an equal sign.
4. To evaluate an algebraic expression means to find the value of the expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.