It means they have the plague, Stay away.
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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.
x2 means "x squared" aka "x to the power of 2"
I think (hope) you mean square, not linear. Answer is 18 ft2
It depends on how big the bricks are? How big are they? And does 10X10 mean 10X10 metres or feet?
depends if you mean 1) 7 x 1ft. sq. OR 2) 7ft. sq