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.
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In a group, the identity property is that each group contains an element, i, such that for all elements x, in the group, i*x = x*i = x. i is called the identity element.
If the function of the variable x, is f(x) then the roots are all the values of x (in the relevant domain) for which f(x) = 0.
Identify Repeat/Recurring discrepancies by entering in red "Repeat/Recurring" in the "DISCREPANCY" block. For further guidance reference AFI 21-101.
A karyotype will do that.
You replace x = 0, and do the calculations.