Module 22 (pages 8893) 

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. 