It means any number multiplied by one is itself. And any number divided by one is itself. One is the only number which has this distinctive property.
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Parentheses are brackets which are rounded kind. Like the one below: ( ..... )
A ray in math is a part of a line that has one end point
The quadrant is the one of the four quaters of a circle. It is the math term for a 1/4 of a circle.
In math, proportional means that two quantities always have the same relative size. For example, the lengths of these two shapes are proportional (one shape's length is always twice as large as the other.)
A polynomial is an expression with many different terms whereas a monomial has only one term. There are other poly- word like polygon or polyhedron but their mono- counterparts do not exist.