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absolute value accumulated value addition age word problems algebraic expressions arbitrary variable area average balance base change break even circle coin combinations combinations commission compound interest consecutive integers continuous compounding conversions cost cost function cramers method decimal depreciation dice discount distance division doubling time draw without replacement elimination equation exponent factorial fraction function fundamental rule of counting greatest common factor how to solve algebra word problems hypothesis testing inequality intersection interval notation least common multiple literal equations math anxiety mean mental models multiplication no calculator percent percentage perimeter population growth probability problem library product profit proof proportion pythagorean theorem quadratic equation quantity quotient rate ratio reciprocal rectangle rectangle word problem revenue right triangle salary sales tax sample space sat exam segment sequence series set notation sign operations simple interest simplify simultaneous equations slope split interest square root statistics substitution subtraction sum system of equations tax temperature time unit cost unit rate variation volume wages word problem