- How can one correct a malformed URL?

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How do you factor completely? 25x^2-81 and 4x^2-7x+2? Calculate the change that occurs in the particles electrostatic potential energy, when the particle is:? Two red blood cells each have a mass of 9.05*10^-14 kg and carry a negative charge spread uniformly over their surfaces.? A geometric sequence begins 15, 3, 3/5, 3/25, 3/125,.... Find the common ratio r for this sequence.? additional questions in comments.? When will Mercury be "eaten" by the Sun? Will it be after the human race is gone in a billion or so years?