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Evaluate expressions. A variable is a letter, for example x, y or z, that represents an unspecified number. 6 + x = 12. To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations.

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An algebraic expression is a mathematical phrase that can contain ordinary numbers, variables like x or y and operators like add,subtract,multiply, and divide.

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A variable is a quantity that may change within the context of a mathematical problem or experiment.

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the part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations.

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A terminating decimal is a decimal that ends. It's a decimal with a finite number of digits.

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a decimal numeral that, after a certain point, consists of a group of one or more digits repeated ad infinitum

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any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.

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The coordinate plane defined with description of x,y axis, quadrants, origin.

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On a number line, positive integers are all the numbers to the right of the zero.

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Two integers are opposites if they are each the same distance away from zero, but on opposite sides of the number line.

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An integer to the left of zero on the number line. It is less than zero.

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A number that is not a fraction.

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The use of a horizontal bar over decimal digits to indicate that they repeat. The bar above indicates that the 3 repeats forever.

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he magnitude of a real number without regard to its sign.

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Using the fact that physical quantities added to or equated with each other must be expressed

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A rate is a special ratio in which the two terms are in different units

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A mathematical expression or function so related to another that their product is one

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Commutative property is one of the basic properties of a number