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 Light-year The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 1012) kilometers or 5.88 trillion (5.88 × 1012) miles. Line an infinite path connecting an infinite number of points Line Plot A sketch of data in which check marks, X's, or other marks above a number line show the frequency of each value. Logarithm (Log) The exponent of the power to which a base number must be raised to equal a given number. Example: 2 is the logarithm of 100 to the base 10 (2=log10 100). (10 must be raised to the power of 2 in order to eqaul 100)  