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How comes SrSO4 is insoluble in water? If x^2+6x=9, what is the value of (x+3)^2? The answer is 18. I completed the square but i'm not sure what to do next? If the ratio of carbon-14 to carbon-12 in a piece of bone is only one-quarter of the atmospheric ratio, how old is the bone? Please solve this polynomial and ordinary differential equation problem? Can you take loratadine and excedrin together?