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Expression? Find the center and radius of the circle defined by the equation x^2+y^2-6x+2y-6=0.? Find X so that the between points (6,-1) and (X,9) is 12.? The least common multiple of 2 numbers is 60. One of the numbers is 7 less than the other. What are the numbers? 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?