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Why can t a solutions pH aways be used to estimate the concentration of acid within a solution? Modeling with linear equations help? How many have died so far in the earthquake in Mexico? Find the coordinate of the points that divide the segment with endpoints at A(-12,3) and B(13,18) into 5 equal parts.? Find the Length of RS if S is between R and T, the Length of RS is 1/4 the length of RT, RS=3x-3, and ST=2x+6?