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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.
(X) or X with a line above it
There is no first number above 0. If x was considered to be the first number above zero then x/2 would be above zero but nearer to it. And then half that number would be above zero and nearer still. And so on.
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The Roman numeral 'X' represents 10.