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What is the pH of a 0.12M Na2HPO4 solution? 8.46 electric circuit? Why does a bicycle produce maximum torque when sprocket arms are in a horizontal position? Find all values of x for which the geometric series converges and find its sum. Σ (n 0 to inf)(3x-11)^n.? Using straight edge and compass, divide given circle into 9 parts of equal area?