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Because if you didn't, there could be more than answer and there would be no way to decide which is correct.

For example, "10+6/2": If you do this from left to right, you get 16/2 = 8. If you follow the rules, you do the division before the addition: 10+3 = 13.

13 is correct.

If you wanted 8, you would write (10+6)/2, then you would have to simplify inside the parentheses before dividing.

Q: Why is it important to have rules for simplifying an expression that contains more than one operation?

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It is an expression and if it contains an equality sign then it is an equation.

A expression that only contains numbers is a Numerical

equations

An algebraic expression.

A rational expression is an expression that contains a radical, i.e., a root.

Related questions

That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.

The question contains an expression -10-10x = -10(1+x). Since it is not an equation nor inequality, it cannot have a solution.

It is an expression and if it contains an equality sign then it is an equation.

An algebraic expression is a type of expression that contains a variable or variables.

An algebraic expression is a type of expression that contains a variable or variables.

A numerical expression!

A expression that only contains numbers is a Numerical

Logarithm is a mathematical expression and is very important. This is the sentence which contains the word logarithm.

An algebraic expression is an expression or and equation that contains at least 1 variable

An expression which contains polynomials in both the numerator and denominator.

rational expression

rational expression