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Numbers Directed Numbers Many of the numbers we use represent situations which have directions as well as size The numbers which ha...
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What is an Equation An equation says that two things are equal. It will have an equals sign "=" like this: x + 2 = 6 That ...
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Angles of Elevation and Depression The angle of elevation of an object as seen by an observer is the angle between the horizontal an...
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Equation of a Straight Line The equation of a straight line is usually written this way: y = mx + b (or "y = mx + c" i...
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