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 Scalar Any real or complex number. Scientific notation In scientific notation, numbers appear as a number greater than or equal to 1 and less than 10 multiplied by some power of 10. For example, . Segment A part of a line or curve lying between two of its points. Set A set is a collection of objects, and these objects are called the elements of the set. In mathematics, we usually consider sets of numbers. For example, is the set of integers. Sign The positive or negative of a number, quantity or expression. Similar Two plane figures are similar if their corresponding angles are equal and their corresponding sides are in proportion. Simplify To reduce an expression to a simpler form. Slope The slope of a straight line is the ratio of the rise to the run of any two distinct points on the line or segment. Linear Equations Solution set The set of all solutions to an algebraic equation or system of equations.. Solve To find the value or set of values of the variables that satisfy an equation or system of equations. Linear Equations Square A plane geometric figure with four sides of equal length and four right angles ran equilateral rectangle. Square bracket Either of the pair of brackets, [ and ]. Removing Parenthesis Squared Raised to the second power, having exponent 2. Square number An integer that is a perfect square of another integer. Square root A number or quantity that when multiplied by itself is equal to a given number or quantity. For example -3 and 3 are square roots of 9, since (-3)2 and (3)2 are equal to 9. Subtract To calculate the difference between a pair of given quantities by subtraction. Subtrahend The number to be subtracted from another (the minuend). Sum The result of the addition of two or more expressions. Summand A number or quantity to be added to others. Symbol A letter or sign used to represent a number, quantity, function, etc. For example represents the ratio of circumference over its diameter, e represents the base of the natural logarithm, etc. System A set of equations or inequalities that are to be solved simultaneously.