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 Module 2-2 (pages 88-93) EQ: How is mathematics helpful in search and rescue operations? Positive: Numbers that are greater than zero (can be fractions if they are in the set of real numbers – whole numbers if they are in the set of integers)      Example: +1, +2, +3, +4…. Negative: Numbers that are less than zero (can be fractions if they are in the set of real numbers – whole numbers if they are in the set of integers)      Example: -1, -2, -3, -4… Integer: The set of positive, negative whole numbers and zero.   Example: -4,-3,-2,-1,0,+1,+2,+3,+4… Inequality: A mathematical sentence where one quantity is greater or less than another.  Inequalities use the symbols <, >, ≤, ≥ Opposite: Two numbers that are the same distance from zero on a number line. Example: +4 and –4, -7 and +7 Absolute Value: The distance from a number to zero on a number line (The positive value of any number.)  Example: Plane: A flat surface that goes on forever in all directions.  Example: Intersect: When two lines share at least one point, they intersect (cross)…remember lines continue on forever in both directions. Perpendicular: Two lines that intersect at 90° angles. (a corner) Coordinate Plane: A grid with a horizontal axis (x) and a vertical axis (y) that intersect at a point. Origin: The coordinates (0,0) on a coordinate plane. Ordered Pair: A pair of numbers indicating and (x, y) position. Coordinate: A number in an ordered pair, referring to either the x or the y position.