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What is the chemical formula for road salt? What are gradually changes on earth? (25^x)/(125^-3x) = 625^2x-3 how do you solve for x? If the function f(x)=-x^4+2x^2-1 odd, even, or neither? Why? One race car has greater acceleration than second race car.But the second race car can reach a higher speed than first.How is this possible?