an expression that contains a variable (a symbol used to represent one or more numbers)
an expression, such as 4.50 x 4, that names a particular number
replacing a numerical expression by the simplest name for its value
a device, such as a pair of parentheses, used to enclose an expression that should be simplified first.
formed by placing equals sign between two numerical or variable expressions, called the sides of the equation
sentences containing variables (like the equations 5x - 1 = 9 and y + 2 = 2 + y)
the given set of numbers that a variable can represent
solution / root
any value of a variable that turns an open sentence into a true statement
sum / difference / product / quotient
addition / subtraction / multiplication / division
any number that is either positive, negative, or zero
positive integers, negative integers, and zero
zero and all positive integers
used to show the order of two real numbers (< less than, > greater than)
each number in a pair such as 4 and -4
the positive number of any pair of opposite non-zero real numbers is called the absolute value of each number in the pair
the set of all solutions of an open sentence
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