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How can I answer a question? The smallest of 11 consecutive integer is -4 times as large as the largest, what is the sum of these 11 integers.? How many country in the whole world? Can somebody help me differentiate f(x)= (-x^2-1)/(x^2-1)^2 and get the answer as f''(x)= (2x^3 +6x)/(x^2-1)^3? How many times can 20 go into 183?