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It means they have the plague, Stay away.
A red X usually means the object is disconnected or not turned on. It looks like a big red X over the device. Click on the device with the red X and read the menu that pops up letting you know the problem.
If you mean -(x^2) * x then the answer is -x^3 if you mean (-x)^2 * x then the answer is x^3
Mean absolute deviation = sum[|x-mean(x)|]/n Where mean(x) = sum(x)/n and n is the number of observations. |y| denotes the absolute value of y.
This question is ambigous. If you mean (x+6)/x then it simplifies to 1 + (6/x) If you mean x + (6/x) then it can't really be simplified.